Question

the vertex is which letter? a b c none of the above

Explanation:

Step1: Recall the definition of an angle's vertex

The vertex of an angle is the common endpoint of the two rays that form the angle.

Step2: Identify the vertex in the given figure

In the figure with rays \(BA\) and \(BC\), the common endpoint of these two rays is point \(B\). So, the vertex of the angle is \(B\).

Answer:

B. B