Problem 10. Triangle,  Angles, 80 and 20 degrees, Congruence. Level: High School, SAT Prep, College geometry

In the figure, AB = CD, angle A = 80º and angle C = 20º. Find x. Post a comment or solution. Try to use elementary geometry (Euclid's Elements.)

 

See Also:

Problem 11.
Right triangle, cevian, angles, degrees.

Problem 9.
Triangles, equal segments, angles, 30 degrees.

Problem 8.
Triangles, equal segments, angles, 45 degrees.