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4MA1/2F Jun 2018, Question 19: Surface Area of a Cuboid and Cylinder

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 4 marks

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The question, in short

Two similar cylinders A and B are shown; A has height 1.6 m and radius 0.56 m, B has height 0.6 m. Find A's curved surface area and B's radius.

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Part (a) · 2 marks

Calculate the curved surface area of cylinder A, giving the value in m² to 3 significant figures.

  1. 1Curved surface area of a cylinder = 2πrh.
  2. 22 × π × 0.56 × 1.6 = 5.6298...
  3. 3To 3 significant figures: 5.63

Answer5.63

Part (b) · 2 marks

Using similarity between the cylinders, determine the radius of cylinder B.

  1. 1Length scale factor = 0.6 ÷ 1.6 = 0.375
  2. 2Radius of B = 0.375 × 0.56 = 0.21

Answer0.21

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