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17 February, 18:01

The ratio of the diameters of two circles is y:z. What is the scale factor of the circles?

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  1. 17 February, 18:13
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    The scale factor is the ratio of the areas of the 2 circles.

    areas = pi (y/2) ^2 and pi (z/2) ^2

    so required ratio = y^2 : z^2
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