Q. The ratio of the circumferences of two circles is 7 : 9. The ratio of their areas is:
✅ Correct Answer: (B)
49 : 81
Explanation: Circumference ∝ radius. Therefore area ratio = 7² : 9² = 49 : 81.
Explanation by: Mr. Dubey
Circumference ∝ radius. Therefore area ratio = 7² : 9² = 49 : 81.