Some triangles are equilateral, but not all of them. There are three types of triangles. Triangles which have three equal sides and three equal angles are called equilateral triangles. Isosceles triangles have two equal sides and two equal angles. Scalene triangles have no equal sides and no equal angles.
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Triangles are equilateral triangles only when all of their 3 sides are equal in lengths.
Yes. But not all isosceles triangles are equilateral.
No. For it to be equilateral it can't be a right triangle.
Two equilateral triangles are always similar!
An octogon contains 6 equilateral triangles.