Question

What is the total surface area of an iron sphere having a radius of 11 cm?

(a) 1529.76 cm^2

(b) 1514.76 cm^2

(c) 1519.76 cm^2

(d) 1419.76 cm^2

This question was posed to me in an online interview.

This is a very interesting question from Surface Area and Volume of Different Solid Shapes in chapter Surface Area and Volumes of Mathematics – Class 10

Answer 1

Correct choice is (c) 1519.76 cm^2

The explanation: The total surface area of an iron sphere = 4πr^2

= 4 × \(\frac {22}{7}\) × 11^2

= 1519.76 cm^2