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 Form 4 Mathematics Paper 1 Exam Revision Questions With Answers Set 3

The diagram alongside shows a solid frustrum whose top radius is 35 cm and bottom radius 42 cm. The height of the frustrum is 50 cm as shown.
a) Calculate
i) the curved surface area of the frustrum
ii) the area of the top surface
iii) the area of the bottom surface.
iv) to 3 significant figures, the total surface area of the frustrum in square metres.
b) The frustrum is to be painted on all surfaces at a cost of sh 400 per square metre. Determine the cost of painting the frustrum. ( Take π=22/7)

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