# There is a ratio 1 : 4 between surface area of two spheres find the ratio between their radius.

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There is a ratio 1 : 4 between surface area of two spheres, find the ratio between their radius.

answered Mar 16 by (-854 points)

Let radius of spheres are r1 and r2

So, surface area of spheres is 4πr12 and 4πr22

Ratio of surface area = 4πr12/ 4πr22 = ¼

= r12/r22 = ¼

r1/r2 = 1/2

Hence, the ratio between their radius = 1 : 2.