Question

which part of the angle is the vertex? a. point a b. point c c. $overrightarrow{ac}$ d. $overrightarrow{ab}$

Explanation:

Step1: Recall angle - vertex definition

An angle is formed by two rays with a common endpoint. The common endpoint is called the vertex of the angle.

Step2: Identify the common endpoint

In the given angle $\angle BAC$, rays $\overrightarrow{AB}$ and $\overrightarrow{AC}$ have a common endpoint A. So point A is the vertex.

Answer:

A. Point A