Mathematics 10-3 Module 5 Self-Check

Module 5: Angles

SC 6. All the angle pairs are supplementary. It is given that ∠c has a measure of 60° and ∠d has a measure of 120°, which add up to 180°. Therefore, the angles are supplementary.

However, the circled supplementary angles are not adjacent because they do not have a ray in common.

The top left diagram is not circled. The top right diagram, which shows angles d and c beside each other with parallel arms but not touching, is circled. The bottom left diagram, which shows angles d and c arranged in different orientations beside each other, is circled. The bottom right diagram is not circled.