Question

Measuring and Constructing Angles; Tutorial

Answer 1

An angle is a figure formed by two rays, or sides,with a common endpoint called the vertex (plural:vertices). You can name an angle several ways: by its vertex, by a point on each ray and the vertex,or by a number

Answer 2

The set of all points between the sides of the angle is the interior of an angle. The exterior
of an angle is the set of all points outside the angle.

Angle Name:

<R, <SRT, <TRS, or <1

You cannot name an angle just by its vertex if the point is the vertex of more than one angle. In this case, you must use all three points to name the angle, and the middle point is always the vertex.