Question

The C.S.A of a cylinder is 792 Sq. cm find its height if its radius is 7cm​

Answer 1

Hi there,

Given height of the cylinder = 21cm

CSA (lateral surface area) of the cylinder = 792cm²

Therefore 2πrh = 792cm²

→ 2×22/7×r×21 = 792cm²

→ 44×r×3 = 792cm²

→ 132×r = 792cm²

→ r = 792/132

→ r = 6cm

Hence diameter of the cylinder = 6 × 2 = 12cm ( as we know diameter is always double of radius )