Type of Triangel 1

Triangles can be classified according to the relative lengths of their sides:
[1] In an equilateral triangle, all sides are of equal length. An equilateral triangle is also an equiangular polygon, i.e. all its internal angles are equal—namely, 60°; it is a regular polygon.
[2] In an isosceles triangle, two sides are of equal length (originally and conventionally limited to exactly two). An isosceles triangle also has two equal angles: the angles opposite the two equal sides.
[3] In a scalene triangle, all sides have different lengths. The internal angles in a scalene triangle are all different.