the vertex of the angle is the point
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vertex angle
The vertex angle is connected to the vertex point
If the 58°-angle is one of the base angles, then the vertex angle is 64°.If the 58°-angle is the vertex angle, then the vertex angle is 58°.
Every angle has a vertex. A vertex is simply the line through the center of each angle. The line splits the angle exactly in half.
A solid angle, measured from a vertex, is the ratio between the area subtended by the angle at the vertex and the the square of the distance to the vertex. The unit of measurement is the stradian.