Question

The height of a circular cylinder is 20 cm and the radius of its base is 7 cm. Find :

1. the volume
2. the total surface area.

Answer 1

For circular cylinder,

Height = h = 20 cm

Radius of the base = r = 7 cm

i. Volume of a cylinder = πr²h

= `22/7 xx 7 xx 7 xx 20  cm^3`

= 3080 cm³ 

ii. Total surface area of a cylinder = 2πr(h + r)

= `2 xx 22/7 xx 7(20 + 7)  cm^2`

= 2 × 22 × 27 cm²

= 1188 cm²