IGCSE Maths 0580 Surface Area and Volume Past Paper Questions and Worked Solutions

IGCSE Maths (0580) · Mensuration · 5.4

Every surface area and volume question from 22 Cambridge IGCSE Mathematics (0580) past papers (May/June 2025 to May/June 2026), syllabus section 5.4. 27 questions covering Core and Extended tiers, ordered from Core to Extended. Each question is labelled with its question paper code (for example 0580/13/M/J/26) and every final answer matches the official Cambridge mark scheme. Try each question first, then click “Show solution” to check your working. This page is part of our IGCSE Maths 0580 Mensuration past paper questions.

0580 Surface Area and Volume past paper questions: Core (Papers 1 and 3)

12 marksCore

May/June 2026 · Paper 1 · 0580/13/M/J/26 · Q14(b)

A right-angled triangular prism has a triangular cross-section with perpendicular sides 3 cm and 4 cm, and length 4 cm. Find the volume of the triangular prism.

Show solution
  1. Volume of a prism = area of cross-section × length.
  2. Cross-section is a right-angled triangle: area = 1⁄2 × 3 × 4 = 6 cm².
  3. Volume = 6 × 4 = 24 cm³
Answer 24 cm³
25 marksCore

May/June 2026 · Paper 3 · 0580/31/M/J/26 · Q15

(a) A cuboid measures 8 cm by 5 cm by 3 cm. Calculate the surface area of the cuboid.

0580/31 May/June 2026 Q15(a) – cuboid 8 cm by 5 cm by 3 cm8 cm3 cm5 cmNOT TOSCALE

(b) A sphere has a radius of 6.4 cm. Calculate the volume of the sphere.

Show solution
Part (a)
  1. A cuboid has three pairs of identical faces: 8 × 5, 8 × 3 and 5 × 3.
  2. Areas: 8 × 5 = 40, 8 × 3 = 24, 5 × 3 = 15.
  3. Surface area = 2 × (40 + 24 + 15) = 2 × 79 = 158 cm²
Answer 158 cm²
Part (b)
  1. Volume of a sphere = 4⁄3πr³.
  2. V = 4⁄3 × π × 6.4³ = 4⁄3 × π × 262.144 = 1098.06…
  3. Round to 3 significant figures: 1100 cm³
Answer 1100 cm³
32 marksCore

May/June 2026 · Paper 3 · 0580/32/M/J/26 · Q11

A cuboid has length 10.8 cm, width 3.7 cm and height 4.6 cm. Work out the volume of the cuboid. Give your answer correct to 1 decimal place.

Show solution
  1. Volume of a cuboid = length × width × height.
  2. V = 10.8 × 3.7 × 4.6 = 183.816 cm³.
  3. Round to 1 decimal place: 183.8 cm³
Answer 183.8 cm³
43 marksCore

May/June 2026 · Paper 3 · 0580/32/M/J/26 · Q24

A sphere has radius 6 cm. Work out the surface area of the sphere. Give the units of your answer.

Show solution
  1. Surface area of a sphere = 4πr².
  2. 4 × π × 6² = 4 × π × 36 = 144π = 452.38…
  3. Round to 3 significant figures and give units of area: 452 cm²
Answer 452 cm²
54 marksCore

May/June 2026 · Paper 3 · 0580/33/M/J/26 · Q26

The radius of a sphere is 3.6 cm. A cone has radius r cm and slant height 8 cm. The surface area of the sphere is equal to the curved surface area of the cone. Find the value of r.

0580/33 May/June 2026 Q26 – sphere of radius 3.6 cm and cone with slant height 8 cm and radius r cm3.6 cm8 cmr cmNOT TOSCALE
Show solution
  1. Surface area of the sphere = 4πr² = 4 × π × 3.6² = 4 × π × 12.96 = 51.84π cm².
  2. Curved surface area of the cone = πrl = π × r × 8 = 8πr cm².
  3. They are equal: 8πr = 51.84π.
  4. Divide both sides by 8π: r = 51.84 ÷ 8 = 6.48
  5. Tip: Leave π in both expressions. It cancels, so the answer is exact.
Answer 6.48
63 marksCore

Feb/Mar 2026 · Paper 3 · 0580/32/F/M/26 · Q12

A cuboid has length 10 cm, width 3 cm and height 4 cm. Work out the surface area of the cuboid.

Show solution
  1. A cuboid has three pairs of identical faces: 10 × 3, 10 × 4 and 3 × 4.
  2. Areas: 10 × 3 = 30, 10 × 4 = 40, 3 × 4 = 12.
  3. Surface area = 2 × (30 + 40 + 12) = 2 × 82 = 164 cm²
Answer 164 cm²
75 marksCore

Feb/Mar 2026 · Paper 3 · 0580/32/F/M/26 · Q17

(a) A cone has a radius of 7 cm and a height of 8 cm. Work out the volume of the cone.

(b) A trapezium has parallel sides 6 m and 20 m and perpendicular height 10 m (slanting side 15 m). Work out the area of the trapezium. Give the units of your answer.

0580/32 February/March 2026 Q17(b) – trapezium with parallel sides 6 m and 20 m, height 10 m and slant side 15 m6 m20 m10 m15 mNOT TOSCALE
Show solution
Part (a)
  1. Volume of a cone = 1⁄3πr²h.
  2. V = 1⁄3 × π × 7² × 8 = 1⁄3 × π × 49 × 8 = 410.50…
  3. Round to 3 significant figures: 411 cm³
Answer 411 cm³
Part (b)
  1. Area of a trapezium = 1⁄2(a + b)h, using the parallel sides and the perpendicular height.
  2. Area = 1⁄2 × (6 + 20) × 10 = 13 × 10 = 130.
  3. The lengths are in metres, so the area is in square metres: 130 m²
  4. Tip: The 15 m sloping side is not needed for the area.
Answer 130 m²
83 marksCore

Oct/Nov 2025 · Paper 3 · 0580/32/O/N/25 · Q19

A cylinder has radius 5 cm and height 12 cm. A cube has edges of x cm. The cylinder has the same volume as the cube. Find the value of x.

0580/32 October/November 2025 Q19 – cylinder of radius 5 cm and height 12 cm, and a cube of side x cm5 cm12 cmx cmx cmx cmNOT TOSCALE
Show solution
  1. Volume of the cylinder = πr²h = π × 5² × 12 = 300π = 942.47… cm³.
  2. Volume of the cube = x³, and the volumes are equal: x³ = 942.47…
  3. Take the cube root: x = ∛942.47… = 9.804…
  4. 9.80
Answer 9.80
93 marksCore

Oct/Nov 2025 · Paper 3 · 0580/33/O/N/25 · Q23(b)

A candle is in the shape of a cone. The volume of the candle is 900 cm³. The height of the candle is 8 cm. Calculate the radius of the candle.

Show solution
  1. Volume of a cone = 1⁄3πr²h, so 1⁄3 × π × r² × 8 = 900.
  2. Multiply both sides by 3: 8πr² = 2700.
  3. Divide both sides by 8π: r² = 2700 ÷ (8π) = 107.43…
  4. Square root: r = √107.43… = 10.36… = 10.4 cm
Answer 10.4 cm
101 markCore

May/June 2025 · Paper 1 · 0580/11/M/J/25 · Q11

Calculate the volume of a cube with side length 3 cm.

Show solution
  1. Volume of a cube = side × side × side.
  2. Volume = 3 × 3 × 3 = 27 cm³
Answer 27 cm³
115 marksCore

May/June 2025 · Paper 1 · 0580/12/M/J/25 · Q10

A cuboid has length 5 cm, width 2 cm and height 3 cm.

(a) Draw a net of the cuboid on the 1 cm² grid.

0580/12 May/June 2025 Q10 – 1 cm square grid for the net

(b) Work out the volume of the cuboid. Give the units of your answer.

Show solution
Part (a)
  1. A cuboid has 6 faces in 3 matching pairs: two 5 × 2, two 5 × 3 and two 2 × 3 rectangles.
  2. Draw a strip of four faces (5 × 3, 5 × 2, 5 × 3, 5 × 2) that wraps round the cuboid.
  3. Add the two 2 × 3 end faces on opposite sides of the strip, so the net folds into a closed box.
  4. A correct net of six faces: two 5 cm × 2 cm, two 5 cm × 3 cm and two 2 cm × 3 cm.
0580/12 May/June 2025 Q10 solution – net of the 5 cm by 2 cm by 3 cm cuboid5 × 35 × 25 × 35 × 23 × 23 × 2
Answer A correct net of six faces: two 5 cm × 2 cm, two 5 cm × 3 cm and two 2 cm × 3 cm.
Part (b)
  1. Volume of a cuboid = length × width × height.
  2. Volume = 5 × 2 × 3 = 30. The lengths are in cm, so the units are cubic centimetres.
  3. 30 cm³
Answer 30 cm³
126 marksCore

May/June 2025 · Paper 1 · 0580/13/M/J/25 · Q8

The diagram shows two faces of a net of a cuboid on a 1 cm² grid: a 3 cm by 3 cm square joined to a 5 cm by 3 cm rectangle.

0580/13 May/June 2025 Q8 – 1 cm grid with a 3 by 3 square and a 5 by 3 rectangle drawn side by side

(a) Complete the statement. The dimensions of the cuboid are ….. cm by ….. cm by ….. cm.

(b) On the grid, complete a net of the cuboid.

(c) Work out the volume of the cuboid.

Show solution
Part (a)
  1. The square face is 3 cm by 3 cm and the rectangle is 5 cm by 3 cm.
  2. So the cuboid’s edges are 3 cm, 3 cm and 5 cm: 3 cm by 3 cm by 5 cm
Answer 3 cm by 3 cm by 5 cm
Part (b)
  1. This cuboid has 6 faces: two 3 × 3 squares and four 5 × 3 rectangles.
  2. Two faces are drawn, so add one more 3 × 3 square and three more 5 × 3 rectangles.
  3. Join them so they fold into a closed box with no overlaps.
  4. A correct net with two 3 × 3 squares and four 5 × 3 rectangles.
0580/13 May/June 2025 Q8 solution – completed net of the 3 cm by 3 cm by 5 cm cuboid5 × 35 × 35 × 33 × 3given
Answer A correct net with two 3 × 3 squares and four 5 × 3 rectangles.
Part (c)
  1. Volume = length × width × height = 3 × 3 × 5 = 45 cm³
Answer 45 cm³
133 marksCore

May/June 2025 · Paper 1 · 0580/13/M/J/25 · Q9

The diagram shows the net of a square-based pyramid. The perpendicular height of each triangle is 4 cm. The base has side length 5 cm.

0580/13 May/June 2025 Q9 – net of a square-based pyramid, base 5 cm and triangle height 4 cm4 cm5 cmNOT TOSCALE

(a) Calculate the surface area of the pyramid.

(b) Write down the number of edges of the square-based pyramid.

Show solution
Part (a)
  1. The surface area is the total area of all the faces: 4 triangles and 1 square.
  2. Area of one triangle = 1⁄2 × base × height = 1⁄2 × 5 × 4 = 10 cm².
  3. Four triangles = 4 × 10 = 40 cm².
  4. Square base = 5 × 5 = 25 cm².
  5. Surface area = 40 + 25 = 65 cm²
Answer 65 cm²
Part (b)
  1. The base has 4 edges, and there are 4 sloping edges up to the top point.
  2. Number of edges = 4 + 4 = 8
Answer 8

0580 Surface Area and Volume past paper questions: Extended (Papers 2 and 4)

144 marksExtended

May/June 2026 · Paper 2 · 0580/21/M/J/26 · Q21(a,b)

A solid cuboid ABCDEFGH has BF = 2 cm, BC = 6 cm and CD = 9 cm.

0580/21 May/June 2026 Q21 – cuboid ABCDEFGH with diagonal CE9 cm6 cm2 cmDCBAHGFENOT TOSCALE

(a) Calculate the volume of the cuboid. (b) Calculate the surface area of the cuboid.

Show solution
Part (a)
  1. Volume of a cuboid = length × width × height = CD × BC × BF.
  2. Volume = 9 × 6 × 2 = 108 cm³
Answer 108 cm³
Part (b)
  1. A cuboid has three pairs of identical faces: 9 × 6, 9 × 2 and 6 × 2.
  2. Areas: 9 × 6 = 54, 9 × 2 = 18, 6 × 2 = 12.
  3. Surface area = 2 × (54 + 18 + 12) = 2 × 84 = 168 cm²
Answer 168 cm²
155 marksExtended

May/June 2026 · Paper 2 · 0580/22/M/J/26 · Q2

The diagram shows an accurate net of an open box in the shape of a cuboid. All the dimensions are whole numbers of centimetres.

0580/22 May/June 2026 Q2 – accurate net of an open cuboid box

(a) Find the total area of the net. (b) Find the volume of the open box.

Show solution
  1. Measure the net with a ruler. The edges are 2 cm, 3 cm and 5 cm.
  2. The open box has a 3 × 5 base, two 2 × 3 end faces and two 2 × 5 side faces. It has no lid.
Part (a)
  1. Add the areas of the five faces.
  2. Base: 3 × 5 = 15. Ends: 2 × (2 × 3) = 12. Sides: 2 × (2 × 5) = 20.
  3. Total area = 15 + 12 + 20 = 47 cm²
Answer 47 cm²
Part (b)
  1. Volume = length × width × height = 5 × 3 × 2 = 30 cm³
Answer 30 cm³
162 marksExtended

May/June 2026 · Paper 2 · 0580/22/M/J/26 · Q16

The volume of a sphere is 500 cm³. Using the approximation of 3 for π, find an estimate for the radius of the sphere.

Show solution
  1. Volume of a sphere = 4⁄3πr³. Use 3 for π.
  2. 4⁄3 × 3 × r³ = 500. The 3s cancel, so 4r³ = 500.
  3. Divide by 4: r³ = 125.
  4. Cube root: r = ∛125 = 5 cm
Answer 5 cm
172 marksExtended

May/June 2026 · Paper 2 · 0580/23/M/J/26 · Q14

A sphere has volume 36π cm³. Find the radius of the sphere.

Show solution
  1. Volume of a sphere = 4⁄3πr³.
  2. 4⁄3πr³ = 36π. Divide both sides by π: 4⁄3r³ = 36.
  3. Multiply by 3⁄4: r³ = 36 × 3⁄4 = 27.
  4. r = ∛27 = 3 cm
Answer 3 cm
183 marksExtended

May/June 2026 · Paper 4 · 0580/42/M/J/26 · Q16(a,b)

ABCDE is a square-based pyramid. EC and BD intersect at F. AF is perpendicular to the base BCDE. BC = 16.5 cm and AF = 28 cm.

0580/42 May/June 2026 Q16 – square-based pyramid ABCDE with apex A above F, the centre of the base

(a) Write down the number of planes of symmetry of the pyramid.

(b) Calculate the volume of the pyramid.

Show solution
Part (a)
  1. A square-based pyramid has two planes through the diagonals of the base and two through the midpoints of opposite sides.
  2. 4
Answer 4
Part (b)
  1. Volume of a pyramid = 1⁄3 × base area × height.
  2. Base area = 16.5 × 16.5 = 272.25 cm². Height AF = 28 cm.
  3. V = 1⁄3 × 272.25 × 28 = 2541 cm³
Answer 2541 cm³
195 marksExtended

May/June 2026 · Paper 4 · 0580/43/M/J/26 · Q21

The diagram shows a frustum. The radius of the top is 8 cm, the radius of the base is 12 cm and the height is 9 cm. Calculate the volume of the frustum.

0580/43 May/June 2026 Q21 – frustum with top radius 8 cm, base radius 12 cm and height 9 cm8 cm12 cm9 cmNOT TOSCALE
Show solution
  1. A frustum is a large cone with a small cone cut off the top. Find the height of the small cone first.
  2. Let the small cone have height h. The large cone then has height h + 9.
  3. The two cones are similar, so h⁄8 = h + 9⁄12.
  4. Cross-multiply: 12h = 8(h + 9) = 8h + 72, so 4h = 72 and h = 18. The large cone has height 18 + 9 = 27 cm.
  5. Volume of large cone = 1⁄3 × π × 12² × 27 = 1296π.
  6. Volume of small cone = 1⁄3 × π × 8² × 18 = 384π.
  7. Frustum = 1296π − 384π = 912π = 2865.1…
  8. 912π = 2870 cm³ (3 s.f.)
Answer 912π = 2870 cm³
207 marksExtended

Feb/Mar 2026 · Paper 2 · 0580/22/F/M/26 · Q18

A cone has radius r cm and sloping edge 12 cm. A hemisphere has radius 4 cm. The total surface area of the cone is equal to the total surface area of the hemisphere.

0580/22 February/March 2026 Q18 – cone with slant 12 cm and radius r cm, and a hemisphere of radius 4 cm12 cmr cm4 cmNOT TOSCALE

(a) Show that r² + 12r − 48 = 0.

(b) Find the exact value of the radius of the cone. Give your answer as a surd in its simplest form.

Show solution
Part (a)
  1. Total surface area of the cone = circular base + curved surface = πr² + πrl = πr² + 12πr.
  2. Total surface area of the hemisphere = curved surface + flat circle = 1⁄2 × 4π × 4² + π × 4².
  3. That is 32π + 16π = 48π.
  4. Set them equal: πr² + 12πr = 48π.
  5. Divide by π and rearrange: r² + 12r − 48 = 0 ✓
Answer r² + 12r − 48 = 0
Part (b)
  1. Complete the square: r² + 12r = (r + 6)² − 36.
  2. So (r + 6)² − 36 − 48 = 0, which gives (r + 6)² = 84.
  3. Square root both sides: r + 6 = ±√84. Simplify √84 = √(4 × 21) = 2√21.
  4. r = −6 ± 2√21. A radius must be positive, so r = 2√21 − 6
Answer r = 2√21 − 6
219 marksExtended

Feb/Mar 2026 · Paper 4 · 0580/42/F/M/26 · Q9

A tank in the shape of a sphere has radius 40 cm.

(a) Show that the capacity of the tank is 268 litres, correct to the nearest litre.

(b) The tank contains 268 litres of water. The water is emptied into a cylindrical container at a rate of 300 ml per second. (i) Calculate the time taken for the tank to be completely emptied. Give your answer in minutes and seconds, correct to the nearest second. (ii) The cylindrical container has radius 50 cm and height 40 cm. Calculate the percentage of the container that is filled with water.

Show solution
Part (a)
  1. Volume of a sphere = 4⁄3πr³.
  2. V = 4⁄3 × π × 40³ = 4⁄3 × π × 64 000 = 268 082.5… cm³.
  3. 1 litre = 1000 cm³, so divide by 1000: 268.08… litres.
  4. To the nearest litre this is 268 litres ✓
Answer 268 litres
Part (b)(i)
  1. Change litres to millilitres: 268 litres = 268 000 ml.
  2. Time = 268 000 ÷ 300 = 893.33… seconds.
  3. Change to minutes: 893.33… ÷ 60 = 14 remainder 53.33…, so 14 minutes and 53.33… seconds.
  4. 14 min 53 s
Answer 14 min 53 s
Part (b)(ii)
  1. Volume of the cylinder = πr²h = π × 50² × 40 = 100 000π = 314 159.2… cm³.
  2. The water is 268 litres = 268 000 cm³.
  3. Percentage filled = 268 000⁄314 159.2… × 100 = 85.30…
  4. 85.3%
Answer 85.3%
222 marksExtended

Oct/Nov 2025 · Paper 2 · 0580/22/O/N/25 · Q3

A cuboid has length 6 cm, width 5 cm and height 2.5 cm. Work out the volume of the cuboid.

Show solution
  1. Volume of a cuboid = length × width × height.
  2. 6 × 5 = 30, then 30 × 2.5 = 75.
  3. Volume = 75 cm³
Answer 75 cm³
237 marksExtended

Oct/Nov 2025 · Paper 2 · 0580/22/O/N/25 · Q23

The diagram shows a major sector, AOB, of a circle. The sector angle is 240° and the radius is 12 cm.

0580/22 October/November 2025 Q23 – major sector AOB with angle 240° and radius 12 cm240°12 cmABNOT TOSCALE

(a) Show that the length of the major arc AB is 16π cm.

(b) OA is joined to OB to form a cone. Work out the volume of the cone. Give your answer in the form (a√b)π⁄3, where a is an integer and b is a prime number.

Show solution
Part (a)
  1. Arc length = angle⁄360 × 2πr = 240⁄360 × 2 × π × 12.
  2. 240⁄360 = 2⁄3 and 2 × 12 = 24, so arc = 2⁄3 × 24π.
  3. Arc length = 16π cm ✓
Answer 16π cm
Part (b)
  1. When the sector is rolled into a cone, the arc becomes the circumference of the base.
  2. 2πr = 16π, so the base radius r = 8 cm.
  3. The radius of the sector, 12 cm, becomes the slant height of the cone.
  4. Height of the cone by Pythagoras: √(12² − 8²) = √(144 − 64) = √80 = √(16 × 5) = 4√5 cm.
  5. Volume = 1⁄3πr²h = 1⁄3 × π × 64 × 4√5 = 256√5π⁄3.
  6. 256√5π⁄3 cm³
Answer 256√5π⁄3 cm³
245 marksExtended

Oct/Nov 2025 · Paper 2 · 0580/23/O/N/25 · Q29

In this question all measurements are in centimetres. Solid A is made from a cylinder and a hemisphere, both of radius 2R. The cylinder has height 5R. Solid B is a cone of radius R and sloping edge x. The total surface area of solid A is equal to the total surface area of solid B. Find R in terms of x.

0580/23 October/November 2025 Q29 – solid A (cylinder with hemisphere) and solid B (cone)2R5RSolid ARxSolid BNOT TOSCALE
Show solution
  1. Solid A has three outside surfaces: the circular base of the cylinder, the curved side of the cylinder and the curved hemisphere on top.
  2. Base: π(2R)² = 4πR². Cylinder side: 2π × 2R × 5R = 20πR². Hemisphere: 1⁄2 × 4π(2R)² = 8πR².
  3. Total for A = 4πR² + 20πR² + 8πR² = 32πR².
  4. Solid B (cone): base πR² plus curved surface πRx.
  5. Set them equal: 32πR² = πR² + πRx.
  6. Divide every term by πR: 32R = R + x.
  7. Subtract R: 31R = x, so R = x⁄31
Answer R = x⁄31
2510 marksExtended

Oct/Nov 2025 · Paper 4 · 0580/41/O/N/25 · Q14

A cube contains a solid metal sphere. The sphere touches all the faces of the cube. The side length of the cube is 8 cm.

(a) Show that the volume of the sphere is 256⁄3π cm³.

(b) Calculate the percentage of the cube that is not occupied by the sphere.

(c) The density of the metal is 7.86 g/cm³. Calculate the mass of the sphere in kilograms. (Density = mass ÷ volume)

(d) The sphere is melted down and made into a solid cylinder with radius 3.1 cm. Calculate the total surface area of the cylinder.

Show solution
Part (a)
  1. The sphere touches all six faces, so its diameter equals the side of the cube: 8 cm.
  2. Radius r = 8 ÷ 2 = 4 cm.
  3. Volume of a sphere = 4⁄3πr³ = 4⁄3 × π × 4³ = 4⁄3 × 64 × π
  4. = 256⁄3π cm³ ✓
Answer 256⁄3π cm³
Part (b)
  1. Volume of the cube = 8 × 8 × 8 = 512 cm³.
  2. Volume of the sphere = 256⁄3π = 268.08… cm³.
  3. Space not filled = 512 − 268.08… = 243.91… cm³.
  4. Percentage not filled = 243.91…⁄512 × 100 = 47.6%
Answer 47.6%
Part (c)
  1. Rearrange density = mass ÷ volume to get mass = density × volume.
  2. Mass = 7.86 × 268.08… = 2107.1… g.
  3. Change grams to kilograms (÷ 1000): 2.11 kg
Answer 2.11 kg
Part (d)
  1. Melting does not change the volume, so the cylinder also has volume 256⁄3π = 268.08… cm³.
  2. Volume of a cylinder = πr²h, so π × 3.1² × h = 268.08…
  3. h = 268.08… ÷ (π × 3.1²) = 268.08… ÷ 30.190… = 8.879… cm.
  4. Total surface area = two circles + curved surface = 2πr² + 2πrh.
  5. 2 × π × 3.1² = 60.38… cm² and 2 × π × 3.1 × 8.879… = 172.95… cm².
  6. Total = 60.38… + 172.95… = 233.3… = 233 cm²
Answer 233 cm²
268 marksExtended

May/June 2025 · Paper 2 · 0580/21/M/J/25 · Q13

The diagram shows solid A and solid B. Solid A is made from a hemisphere and a cone each with radius 6 cm. The cone has sloping edge 10 cm. Solid B is a cylinder with radius 4 cm and height h cm. The total surface area of solid A is equal to the total surface area of solid B.

0580/21 May/June 2025 Q13 – solid A (cone on hemisphere, radius 6 cm, slant 10 cm) and solid B (cylinder radius 4 cm, height h cm)10 cm6 cmSolid A4 cmh cmSolid BNOT TOSCALE

(a) Work out the value of h.

(b) Work out the height of solid A.

Show solution
Part (a)
  1. Solid A has two curved surfaces and no flat faces, because the cone and hemisphere are joined.
  2. Curved surface of the cone = πrl = π × 6 × 10 = 60π.
  3. Curved surface of the hemisphere = half of 4πr² = 1⁄2 × 4π × 6² = 72π.
  4. Total surface area of A = 60π + 72π = 132π.
  5. Solid B (cylinder): two circular ends = 2πr² = 2 × π × 4² = 32π. Curved surface = 2πrh = 8πh.
  6. Total surface area of B = 32π + 8πh.
  7. Set them equal: 32π + 8πh = 132π. Divide by π: 32 + 8h = 132.
  8. 8h = 100, so h = 12.5
Answer 12.5
Part (b)
  1. The height of the cone comes from Pythagoras, using the slant edge and the radius: √(10² − 6²) = √64 = 8 cm.
  2. The hemisphere adds its radius below the cone: 6 cm.
  3. Height of solid A = 8 + 6 = 14 cm
Answer 14 cm
274 marksExtended

May/June 2025 · Paper 2 · 0580/22/M/J/25 · Q16

The diagram shows a solid made by joining a hemisphere to a cylinder. The radius of both the hemisphere and the cylinder is 6 cm. The height of the cylinder is 5 cm. Find the total surface area of the solid. Give your answer in terms of π.

0580/22 May/June 2025 Q16 – hemisphere on top of a cylinder, radius 6 cm, cylinder height 5 cm6 cm5 cmNOT TOSCALE
Show solution
  1. The surface of the solid has three parts: the curved top of the hemisphere, the curved side of the cylinder and the flat circle at the bottom.
  2. The flat face where the hemisphere joins the cylinder is inside the solid, so do not count it.
  3. Hemisphere curved surface = half of 4πr² = 1⁄2 × 4π × 6² = 72π.
  4. Cylinder curved surface = 2πrh = 2 × π × 6 × 5 = 60π.
  5. Circular base = πr² = π × 6² = 36π.
  6. Total = 72π + 60π + 36π = 168π cm²
Answer 168π cm²

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