Question

what is a vertex angle ?​

Answer 1

A vertex angle refers to the angle that is formed by the two lines crossing at a vertex. When asked for a vertex angle, the intended query is typically for the size of the angle in degrees or radians. A vertex is the result of two non-perpendicular lines intersecting, often forming a corner of a shape.

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Answer 2

Vertex angle is angle formed by joining two line segment

angle AOB is vertex angle..