Question

Find the radius of the circle if the circumference is 12 m.

(a) 1.90 m

(b) 1.09 m

(c) 7.90 m

(d) 1.40 m

I have been asked this question during an interview.

This is a very interesting question from Perimeter and Area of a Circle in chapter Area Related to Circles of Mathematics – Class 10

Answer 1

Correct choice is (a) 1.90 m

To elaborate: The circumference of a circle (C) = 2πr.

12 = 2 × \(\frac {22}{7}\) × r

r = \(\frac {12}{2} \times \frac {7}{22}\)

r = 1.90 m