Question

Find the surface area of a sphere of radius 3.5 cm.

Answer 1

Radius of sphere (r) = 3.5 cm

∴ Surface area = 4πr² 

= `4 xx 22/7 xx (3.5)^2`

= `4 xx 22/7 xx 3.5 xx 3.5`

= 88 × 1.75

= 154 cm²