Show that the sum of the angles of a triangle is two right angles.
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From External Angle of Triangle equals Sum of other Internal Angles: ∠ACD=∠ABC+∠BAC. ... But from Two Angles on Straight Line make Two Right Angles, ∠ACB+∠ACD equals two right angles. So by Euclid's First Common Notion, ∠ABC+∠BAC+∠ACB equals two right angles
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