what are all equilateral triangles
An equilateral triangle happens also to be an isosceles triangle. If all three sides are the same length then we can certainly find two sides that are the same length! If that seems strange, well yes, it is different to other terminology we have for shapes. 'Triangle', 'square', 'pentagon', 'hexagon' are all different things. But an isosceles triangle can be an equilateral triangle, and it will be if all three sides are the same length. Testing whether a triangle is equilateral. A triangle must be an equilateral triangle if either of the following is true: 1  All three sides are the same length. 2  All three angles are the same.