Chapter 1, Problem 12CT

To determine

To identify: identify the vertex and sides of $\angle 1$ .

Answer to Problem 12CT

Vertex: X

Sides: $\overline{AX}$ and $\overline{XD}$

Explanation of Solution

Given:

The figure below:

Concept Used:

The two rays with same end point which form the angle are called the sides of the angle and the common end point is called the vertex of the angle.

Observing the given figure and following the above definitions of the sides and vertex of an angle, it can be said that the vertex of $\angle 1$ is X .

And the sides of $\angle 1$ are $\overline{AX}$ and $\overline{XD}$ .