Triangles can't have two sides, but a triangle with three congruent sides is a equilateral or three congruent angles in a triangle is equilangular.
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A triangle with 3 different sided triangular measures is called a scalene triangle basically.
a triangle
what do we call in the two sided fastener
It is an equilateral triangle.
A triangle by definition only has 3 sides, so a 5-sided triangle does not exist - unless you are including the in-side and out-side of it as two more sides. A five sided polygon is a pentagon.