i. The ratio of circumference and area of a circle is 2 : 7. Find its circumference. (A) 14 π (B) 7/π (C) 7π (D) 14/π

Question

The ratio of circumference and area of a circle is 2 : 7. Find its circumference. 

(A) 14 π 

(B) 7/π

(C) 7π 

(D) 14/π

Answer 1

(A) 14 π

Circumference/ (Area of circle) = 2/7

∴ 2πr/πr² = 2/7

∴ r = 7

∴ Circumference = 2πr 

= 2 x π x 7  = 14π