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OpenStudy (anonymous):
Prove that the sum of the measures of the interior angles of a triangle is 180°
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OpenStudy (anonymous):
It's a postulate
OpenStudy (anonymous):
Proof 1 Construct a line through B parallel to AC. Angle DBA is equal to CAB because they are a pair of alternate interior angle. The same reasoning goes with the alternate interior angles EBC and ACB. alternate interior angles
myininaya (myininaya):
You could take a triangle. Do some rotations,reflections, and/or translations to lay the 3 angles on one line to show the sum of the angles equal 180 degrees.
myininaya (myininaya):
That is the most elementary proof you will ever get.
myininaya (myininaya):
That I can think of...lol.
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