Question

1. which postulate explains why angle pqr would be 140 degrees in the picture below? angle addition postulate addition postulate sum angle postulate interior angles postulate

Explanation:

The angle - addition postulate states that if we have two adjacent angles, the measure of the larger angle formed is the sum of the measures of the two smaller adjacent angles. Here, if we assume that the $160^{\circ}$ angle is composed of $\angle PQR$ and the $20^{\circ}$ angle, then $\angle PQR=160^{\circ}- 20^{\circ}=140^{\circ}$ by the angle - addition postulate.

Answer:

angle addition postulate