

Online Geometry Problem 819: Quadrilateral, Triangle, Angles, 30 degrees. Level: High School,
SAT Prep, College,
Mathematics Education

The figure below shows a quadrilateral ABCD
with AB = BC = CD, angle BAC = 40 degrees, and angle CAD = 30 degrees.
Find the measure of angle ADC. Try to use elementary geometry (Euclid's
Elements).







