Prove that the sum of the measures of all angles of a triangle is 180°
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Therefore, the sum of angles A, B, and C must be equal to the sum of the angles B, E, and F. And since the sum of angles A, B, and C is known to be 180, then the sum of angles B, E, and F must also be 180. ... And the three angles in the triangle have the same three angle measures. This will always be true.
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