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If two shapes are similar, then each length is in the same ratio.

The ratio of the heights is 10 : 2

Thus the radii are in the same ratio, ie 4 : x = 10 : 2

→ x = 2 × 4 ÷ 10 = 0.8 units

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Q: What is the radius x of a cone with height 2 units if a similar cone has radius of 4 units and height of 10 units?
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