Question

find the volume and surface of a spare of radius 21 cm​

Answer 1

Step-by-step explanation:

r = 21cm

v=$\frac{4}{3} \pi {r}^{3}$

=$\frac{4}{3} \times \frac{22}{7} \times 21 \times 21 \times 21$

=$4 \times 22 \times 21 \times 21$

= 38808 cm³

T.S.A = 4πr²

=$4\times\frac{22}{7}\times21\times21$

= 4x22x3x21

= 5544cm²