When you are talking about triangles there are three angles. The angle that is opposite of the base of the triangle is called the vertex angle.

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what is a vertex angle

What Is a Vertex Angle?

A vertex is the common point where two or more lines of an angle meet. The vertex is the point at which the angle is measured. The plural form of vertex is "vertices." For example, a triangle has three vertices and a square has four vertices. It is easy...
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