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6 September, 09:37

The volumes of two similar figures are 27 mm^3 and 1331 mm^3. If the surface area of the smaller figure is 18 mm^2, what is the surface area of the larger figure?

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  1. 6 September, 10:04
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    Volumes are in ratio 27 : 1331

    so ratio od individual lengths = cube roots = 3 : 11

    and surface areas will be in the ratio 3^2 : 11^2 = 9:121

    so surface area of the larger figure is 121 * 18 / 9 = 242 mm^2
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