Q8 of 32 Page 115

Curved surface area of a cylinder is 1980 cm2 and radius of its base is 15cm. Find the height of the cylinder.

(π = 22/7)

Given: Curved surface area of the cylinder (CSA) = 1980 cm2

Radius of the base of cylinder (r) = 15 cm


We need to write curved surface area of cylinder, that is


CSA = 2πrh


Where r = radius


h = height of the cylinder


So by substituting values in the formula, we get


1980 = 2 × 22/7 × 15 × h


⇒ h =


⇒ h = 21


Thus, height of the cylinder is 21 cm.


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