Question

A diameter of the base of a right circular cone cylinder is 42cm.if height is 10cm. Find the total surface area of cylinder

Answer 1

Step-by-step explanation:

Diameter of the base of the cylinder =42 cm

∴ r = radius of the base of the cylinder =21 cm

h = height of the cylinder =10cm

∴ curved surface area of the cylinder = 2πrh

$2 \times \frac{22}{7} \times {10cm}^{2} \\ 2 \times 22 \times 3 \times {10cm}^{2} = 1320 {cm}^{2}$

total surface area of the cylinder = 2πr(h+r)

$2 \times \frac{22}{7} \times 21 \times (10 + 21) {cm}^{2} \\ 2 \times 22 \times 3 \times 31 {cm}^{2} = 4092 {cm}^{2}$