Question

The radius of circle is 2.12 cm. Find the area of circle in appropriate significant figures?

(A) 14cm²

(B) 14.1 cm²

(C) 14.11 cm²

(D) 14.1124 cm²

Answer 1

Correct option is (B) 14.1 cm²

Given, 

radius of circle, r = 2.12 cm

Area of circle, A = πr²

= 3.14 x (2.12)²

= 14.11 cm²

Since, the radius is given up to three significant figures. We round off the area up to three significant figures.

Thus,

Area, A = 14.1 cm²