You probably know what an angle is, but what is a vertex? Or for that matter, what is an isosceles triangle? read more
Isosceles Triangles Have Two Equal Sides. There are many types of triangles in the world of geometry. There is a special triangle called an isosceles triangle. In an isosceles triangle, the base angles have the same degree measure and are, as a result, equal (congruent). read more
Each triangle has 3 vertices (the plural of vertex). In an isosceles triangle two of the angles are congruent so the non-congruent angle some times takes on special significance. This page may be out of date. read more
The two equal sides of the isosceles triangle are also called legs. The third side of the isosceles triangle, the side not the same length as the other two, is called the base. Across from the base is the vertex angle, the angle formed by the two sides of the same length. read more