The Equilateral triangle reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Equilateral triangle

In geometry, an equilateral triangle is a triangle in which all three sides have equal lengths.

Equilateral triangle

Equilateral triangles are also equiangular; that is, all three internal angles are also equal to each other and are each 60°.

More at triangle and at trigonometry.

An excellent overview of the Euclidean construction of an equilateral triangle can be found at MathWorld

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