Question

if the T. S. A of sphere is 98.56cm^2,find radius of sphere

Answer 1

Tsa of a sphere=4 πr$r^{2}$

$r^{2}$=98.56/4π

$r^{2}$=7.8431

r=1.357

Answer 2

Tsa of solid sphere = 4πr²

98.56 = 4 * 22/7 * r²

98.56 * 1/4 * 7/22 = r²

689.92/88 = r²

7.84 = r²

2.8 = r

Radius = 2.8 cm ANS