An equilateral triangle is a triangle whose sides are all
of equal length. Its angles are all 60°. In geometry,
an equilateral triangle is a triangle in which all three sides
have equal lengths.
traditional or Euclidean geometry, equilateral triangles are
also equiangular; that is, all three internal angles are also
equal to each other and are each 60°. They are regular
polygons, and can therefore also be referred to as regular
equilateral triangle can be easily constructed using a compass.
Example of an Equilateral Triangle: