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A pair of triangles can form a 4 sided quadrilateral
They are congruent triangles.
trapezoid
Trignometry
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.