Online Geometry
Problem 743: Trapezoid, Triangle, Perpendicular,
Parallel, Angle.
Level: High School, Honors Geometry, College,
Mathematics Education

The figure shows a trapezoid ABCD (BC
parallel to AD) with AB, CE, and AF perpendicular to BC, AD, and
DC, respectively. AF and EC meet at G. If the measure of the angle CBE
is 28 degrees, find the measure of the angle ADG.