# Difference between revisions of "Equilateral triangle"

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One useful way to manipulate an equilateral triangle is to draw an [[altitude]], which would divide it into two 30-60-90 [[right triangle]]s. Using this, the area of an equilateral triangle can be found in terms of a side: <math>\frac{s^2\sqrt{3}}{4}</math>. | One useful way to manipulate an equilateral triangle is to draw an [[altitude]], which would divide it into two 30-60-90 [[right triangle]]s. Using this, the area of an equilateral triangle can be found in terms of a side: <math>\frac{s^2\sqrt{3}}{4}</math>. | ||

[[Category:Geometry]] | [[Category:Geometry]] | ||

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## Revision as of 22:33, 16 December 2012

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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.

The equilateral triangle is the simplest regular polygon. It is also the only type of polygon that such that the equilateral polygon must also be the equiangular polygon.

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: .