Such are usually called equilateral triangles.
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An equilateral triangle can also be called a "regular" triangle
A regular triangle would have all angles equal, each being 60o. Thus a right angled triangle is an "irregular" triangle in that one of its angles is 90o which is not 60o.
Triangle, square, hexagon.
BCR
Polgons that have equal sides and equal angles are regular polygons such as a square or an equilateral triangle