Go Geometry Problems

Online Geometry Problem 4 Art 01. Triangle, Quadrilateral, Angles, 120 Degrees. PicSketch for iPad

In the figure below, AD = CD = BC, and angle C = 2(angle A). Prove that x = 120 - angle A. See also Problem 42.
Try to use elementary geometry (Euclid's Elements.) 

Geometry Problem 4 Art 01, iPad app PicSketch Artwork. Triangle, Quadrilateral, Angle. Elearning
 

See also: Art 00


PicSketch - Pencil Sketch & Drawing Photo Filter Effects
PicSketch by Softease Tech Co., Limited is a photo sketch app for iPhone and iPad, to turn photo into a pencil sketch artwork in a few taps.

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Solution / Comment to Geometry Problem 4