Proof that Sum of Angles in ANY Triangle = 180 degrees

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This is a short video explaining why the sum of the angles in any triangle is always equal to 180 degrees. You may have taken this fact for granted during high school but the proof to it is quite simple.

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For this to work you need to prove the angle constructed at the bottom is indeed the same as angle 'a'.

shairozsohail
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Thank you, from an engineer! I never thought to view a triangle as just a by-product of some parallel lines.

yueibm