Prove the following: if, in a triangle
ABC, angle BAO = angle OAC = 20°, angle ACO = 10°,and angle
OCB = 30°, then angle
OBC = 80°. Try to use elementary geometry (Euclid's Elements.)
![Geometry problem 2 Art 01, iPad app PicSketch Artwork, Triangle problem about triangle, angles](problem002-art-01-triangle-20-80-degrees.jpg)
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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