Online Geometry Problem 698: Quadrilateral, Diagonal,
Angle Bisector, Triangle, 120 Degrees.
Level: High School, Honors Geometry, College,
Mathematics Education

The figure shows a quadrilateral ABCD. AC is
the angle bisector of angle BAD, DB is the angle bisector of angle ADC.
If the measure of angle AED is 120 degrees, find the measure of angle
ACB. See also
typography of problem 698.