Question

Find the surface area and volume of a beach ball of diameter 42 cm. ( π = 22/7)

Answer 1

d=42cm

r=21cm

S.A.=

$4\pi {r}^{2}$

=

$4 \times 22 \times 21 \times 21 \div 7$

5544 cm2

Volume=

$4 \div 3 \times \pi {r}^{2}$

=4/3*22/7*21*21

=1848 cm3

Answer 2

diameter of beach ball =42cm
radius =42/2
R=21cm
surface area of the ball = 4πr²
4 ×22/7×(21)²
4×22/7×21×21
88×2×21
176×21
3696cm³