Question

Question 6
Find the radius of a sphere whose surface area is $154c{m}^2$.

$[Assume\pi =\frac{22}{7}]$

Answer 1

Let the radius of the sphere be r.

Surface area of the sphere = 154 $c{m}^2$

$\therefore 4\pi r^2=154c{m}^2$

$r^2=\left(\frac{154\times 7}{4\times 22}\right)c{m}^2=\left(\frac{7\times 7}{2\times 2}\right)c{m}^{2}r=\left(\frac{7}{2}\right)cm=3.5cm$