The ratio between area of two circles is 64 : 49.  What will be the ratio of their radius?

9 : 7 8 : 7 8 : 9 10 : 7

8 : 7

Ratio of Area = \(\pi \) (r1)2 : \(\pi \)(r2)2 = (r1)2 : (r2)2 ⇒ (r1)2 : (r2)2 = 64 : 49 ⇒ r1: r2= 8 : 7 Ratio of radius = 8 : 7