Question

The curved surface area of a sphere is 1256 cm${}^2$. Find the radius of the sphere. $(\pi =3.14)$

• A. 100 cm
• B. 10 cm
• C. 1 cm
• D. 314 cm

Answer 1

Answer: (B)

10 cm

Given : Curved surface area of a sphere $=1256c{m}^2$

We know that, Curved surface area of a spehre $=4\pi r^2$
$⟹1256=4\times 3.14\times r^2$
$⟹r^2=\frac{1256}{4\times 3.14}$
$⟹r^2=100$
$\therefore r=10cm$

Hence, the answer is $10cm$.