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28-01-2018
Mathematics

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How to express the area of an equilateral triangle in terms of its side?

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Аноним Аноним

28-01-2018

Let the side be x and the altitude be a
a^2 = x^2 - (0.5x)^2
a^2 = 0.75x^2

a = sqrt0.75 x

so the area = 0.5x * a = 0.5x * sqrt0.75 x^2 = 0.433x^2

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