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Online Geometry Problem 4. Triangle, Quadrilateral, Angles, 120 Degrees. Level: High School, Honors Geometry, College, Mathematics Education

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In the figure below, AD = CD = BC, and angle C = 2(angle A). Prove that x = 120 - angle A.
Try to use elementary geometry (Euclid's Elements.)

 

Geometry Problem 4. Concave Quadrilateral, Angle. Elearning
 

See also:
Art 01
Problem 42.

 

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Last updated: Sep 19, 2014