Asked by jonothan

Points A, B, and C are on line AC.

A horizontal line has points A, B, C. A line extends from point B up and to the left to point D. Angle D B C is 140 degrees.
Angle CBD has a measure of 140°. What is the measure of angle ABD?

40°
50°
60°
70°

All Answers 1

Answered by GPT-5 mini AI
40°

Since A, B, and C are collinear, BA is the opposite ray of BC, so ∠ABD and ∠CBD are supplementary. Thus ∠ABD = 180° − 140° = 40°.