Question

Find the radius of sphere whose surface area is $314{cm}^2$. (Use $\pi =3.14$)

• A. $5cm$
• B. $2cm$
• C. $3cm$
• D. $4cm$

Answer 1

The correct option is A $5cm$

Surface area of sphere 314c$m^2$
let radius of sphere be 'r' cm
$\therefore 4\pi r^2=314c{m}^2{r}^2=\frac{314}{4\times 3.14}=25r=\sqrt{25}=5cm$
$\therefore$ radius of sphere is 5cm.