If the ratio of the radii of two spheres is 3:4 than the ratio of their surface area is?
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Let the first sphere = 3x
the secpond sphere = 4x
sum of ratio = 4πr square/ 4πr square.
= 3x square/ 4x square. = 3x *3x/ 4x* 4x = 9/16 =9:16
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