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An equilateral triangle is a triangle in which all sides have equal length and all angles have equal measure. Since a triangle has a total of degrees, each angle of an equilateral triangle has degrees.
One useful way to manipulate an equilateral triangle is to draw an altitude, which would divide it into two 30-60-90 right triangles. Using this, the area of an equilateral triangle can be found in terms of a side: .