Home > Proposed Problems > Previous, Key theorems, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 20, 30, 40, 50, Next

In the figure, AD = BC, BD = CD, mÐ A = 3x, and mÐ DBC = 2x. Find x.

Last updated: July 1, 2007