The ratio between area of two circles is 49 : 25.  What will be the ratio of their radius?

8 : 5 9 : 5 7 : 5 7 : 6

7 : 5

Ratio of Area = \(\pi \) (r1)2 : \(\pi \)(r2)2 = (r1)2 : (r2)2 ⇒ (r1)2 : (r2)2 = 49 : 25 ⇒ r1: r2= 7 : 5 Ratio of radius = 7 : 5