# The altitude of an equilateral triangle is 18 inches. What is the length of a side?

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The side

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The altitude of the triangle

Let us denote the side of the triangle as

The formula for calculating the altitude of an equilateral triangle is :

Altitude

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Length of the side of the triangle is

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If the length of the side of a triangle is

As the perpendicular from vertex divides base equally, we can find height

Hence

But as height is

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