Question

Surface area of a sphere of radius “r” is given by __________

(a) 2πr^2

(b) 4πr^2

(c) 3πr^2

(d) πr^2

I got this question during an online interview.

My query is from Surface Area of a Sphere topic in section Surface Areas and Volumes of Mathematics – Class 9

Answer 1

The correct choice is (b) 4πr^2

The best explanation: If a sphere has radius equal to ”r”, then its surface area is given by 4πr^2.