Question

The curved surface area of a cylinder is 1320 cm² and its base has diameter 21 cm. Find the height of the cylinder.

Answer 1

Given,

Curved surface area of cylinder = 1320 cm²

Diameter of base = 21 cm

Radius of cylinder = \(\frac{21}{2}\) cm

Let height of cylinder = h cm

So,

= 2πrh = 1320

= h = \(\frac{1320}{2πr}\) = \(\frac{1320\times 7\times 2}{2\times 22\times 21}\) = 20 cm

Height of cylinder = 20 cm