Question

3.5 cm,Find the surface areas and volumes of spheres of the given radii. ( = 3.14)

Answer 1

Radius of sphere = 3.5 cm

Surface area = 4 pi r^2

= 4 × 22 × 3.5 × 3.5 / 7

= 4 × 22 × 0.5 × 3.5

= 11 × 14

= 154 cm^2

Volume = 4 /3 pi r^3

= 4 / 3 × 22/7 × 3.5 × 3.5 × 3.5

= 4 × 22 × 0.5 × 3. 5 × 3.5 / 3

= 11×7 × 7 / 3

= 11× 49 / 3

= 539 / 3

= 179.67 cm^3