Question

find the surface area of sphere R=7cm

Answer 1

surface area =4πr²
=)4×22/7×7×7
=)4×22×7
=) 154×4= 616 cm2

Answer 2

$surface \: area \: of \: sphere = 4 \: \pi \: r {}^{2} \\ = 4 \times \frac{22}{7} \times 7 \times 7 \\ = 4 \times 22 \times 7 \\ = 616cm {}^{2}$