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11 February, 02:09

The altitude of an equilateral triangle is 5 cm. what is the length of a side of the triangle?

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  1. 11 February, 05:04
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    Let 2x be the length of a side.

    Consider half of the triangle, by pythagoras theorem, we have

    x^2 + 25 = 4x^2

    Then x=5/sqrt3

    Hence the length is 10/sqrt3 cm
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