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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. The altitude of the triangle is . Using this, the area of an equilateral triangle can be found in terms of a side: .
Notice that all equilateral triangles are similar (since all equilateral triangles have the same angle measurements, so, by AA similarity, all equilateral triangles are similar).