Question

what is the vertex? r p q

Explanation:

In an isosceles triangle (as indicated by the tick marks on sides \( PR \) and \( RQ \)), the vertex angle is at the vertex where the two equal sides meet. Here, sides \( PR \) and \( RQ \) are equal, so their common vertex is \( R \), which is also the vertex of the \( 86^\circ \) angle.

Answer:

A. R