Question

what is the surface area of a sphere with a radius of 8 centimeters?

Answer 1

$surface \: \: area \: of \: sphere \: = 4\pi \:{r}^{2}$

$thus \: voume \: = 4 \times \pi \times {( \frac{8}{100}) }^{2}$

=

$4\pi \: \frac{64}{100}$

$\frac{64\pi}{25} {cm}^{2}$

$or \: \\ = 2.56\pi {cm}^{2} \\ \\ or \: \\ = 2.56 \times 3.14 \\ = 8.0384 {m}^{2}$

Answer 2

formula of total surface area =

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

so

$4 \times \frac{22}7 \times 8 \times 8$

= 804.571 sqaure cm