Given: For the spherical ball,
diameter (d) = 42 cm
To find: Surface area and volume of the beach ball.
Radius (r) = d/2 = 42/2 = 21 cm
Surface area of sphere= 4πr2
= 4 × 3.14 × (21)2
= 4 × 3.14 × 21 × 21
= 5538.96 cm2
Volume of sphere = 4/3 πr3
= 4/3 × 3.14 × (21)3
= 4 × 3.14 × 7 × 21 × 21
= 38772.72 cm3
∴ The surface area and the volume of the beach ball are 5538.96 cm2 and 38772.72 cm3 respectively.