the ratio of volumes of two spheres is 64:8. find the ratio of their surface areas.

Let R be the radius of the first sphere and r be the radius of the second sphere.volume of first spherevolume of second sphere = 64843πR343πr3 = 8Rr3 = 81Rr = 21Now, surface area of first spheresurface area of second sphere = 4πR24πr2 = Rr2 = 212 = 41

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