goldendragon1971

Saturday, February 4, 2017

All sides have the same length...............and all internal angles are 60 degrees..........a 120 degree angle......cut exactly in half................is 60 degrees......

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In geometry, an equilateral triangle is a triangle in which all three sides are equal. In the familiar Euclidean geometry, equilateral triangles are also equiangular; that is, all three internal angles are also congruent to each other and are each 60°.

Equilateral triangle - Wikipedia

https://en.wikipedia.org/wiki/Equilateral_triangle

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Equilateral triangle - Wikipedia

https://en.wikipedia.org/wiki/Equilateral_triangle

In geometry, an equilateral triangle is a triangle in which all three sides are equal. In the familiar Euclidean geometry, equilateral triangles are also equiangular; that is, all three internal angles are also congruent to each other and are each 60°.

Internal angle (degrees)‎: ‎60°

Symmetry group‎: ‎D₃

Edges and vertices‎: ‎3

Schläfli symbol‎: ‎3

Equilateral Triangle -- from Wolfram MathWorld

mathworld.wolfram.com › ... › Triangles › Special Triangles › Equilateral Triangles

by EW Weisstein - ‎2002 - ‎Cited by 2 - ‎Related articles

An equilateral triangle is therefore a special case of an isosceles triangle having not just two, but all three sides equal. An equilateral triangle also has three equal angles. The altitude of an equilateral triangle is. (1) where is the side length, so the area is.