The ratio between area of two circles is 16 : 25.  What will be the ratio of their radius?

4 : 5 6 : 5 3 : 5 4 : 7

4 : 5

Ratio of Area = \(\pi \) (r1)2 : \(\pi \)(r2)2 = (r1)2 : (r2)2 ⇒ (r1)2 : (r2)2 = 16 : 25 ⇒ r1: r2= 4 : 5 Ratio of radius = 4 : 5