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If the surface area of two spheres is in the ratio 81 : 25, then what is the ratio of their radii. |
5 : 8 7 : 9 5 : 7 9 : 5 |
9 : 5 |
Area 81 : 25 ∴ Radii 9 : 5 *(radii ratio = \(\sqrt {area\;ratio}\)) The ratio of their radii = 9 : 5
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