Question

points a, b, and c are on line ac. angle cbd has a measure of 140°. what is the measure of angle abd?
○ 40°
○ 50°
○ 60°
○ 70°

Explanation:

Step1: Identify straight angle property

Points A, B, C are colinear, so $\angle ABC = 180^\circ$.

Step2: Calculate $\angle ABD$

Subtract $\angle CBD$ from $\angle ABC$.
$\angle ABD = 180^\circ - 140^\circ$

Answer:

A. $40^\circ$