Question

refer to the figure. select the vertex of ∠1.
a) n
b) m
c) p
d) r

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: Analyze ∠1 in the figure

For ∠1, the two rays forming the angle have a common endpoint at point \(M\).

Answer:

B) \(M\)