Problem 210. Triangle, Angles, Auxiliary Lines, Elearning.
In the figure below, given a triangle
ABC, the measure of the angles ACD, BCD, and ABC are a, 3a, and
120 - 2a. If BC = CE, find the measure of the angle CDE.
Auxiliary Line: A line, ray, or segment added to a diagram to help in a proof
or solution.
Problem 210. Triangle, Angles, Auxiliary Lines, Elearning.