Go Geometry Problems

Geometry Problem 10 with Solution: Triangle, Angles, 80 and 20 degrees, Congruence, Auxiliary Lines.

< PREVIOUS PROBLEM  |  NEXT PROBLEM >

In the figure below, AB = CD, angle A = 80 degrees and angle C = 20 degrees. Find x. Try to use elementary geometry (Euclid's Elements.)

 

Proposed Geometry Problem 10, Triangle, Angles
 

See solution below

See also:
Sketch Art of problem 10

Poster and Typography of Problem 10

iPad Poster and Typography of Problem 10 Triangle, Angles, 80 and 20 degrees, Congruence, Auxiliary Lines.

Poster and Typography of Problem 10 Triangle, Angles, 80 and 20 degrees, Congruence, Auxiliary Lines.

Home | Search | Geometry | Problems | All Problems | Open Problems | Visual Index | 10 Problems | Art | 1-10 | Isosceles Triangle 80-20-80 | Key theorems | Email | 1-100 | by Antonio Gutierrez

View or Post a solution
Last updated: Sep 19, 2016

Geometry Problem 10 Solution(s)