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Question
A right circular cylinder just encloses a sphere of radius r units. Calculate the ratio of the areas of the sphere and cylinder
Sum
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Solution
Surface area of sphere = 4πr2 sq.units
C.S.A of cylinder
= 2πr × h
= 2πr × 2r
= 4πr2 sq.units
Ratio = `(4pi"r"^2)/(4pi"r"^2)` = 1 : 1
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Chapter 7: Mensuration - Exercise 7.3 [Page 294]
