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Demonstration of the triangle angle sum theorem, showing that the three interior angles of a triangle add up to 180 degrees.

A triangle with angles labeled A, B, and C, shown being rearranged into a straight line to demonstrate the sum of interior angles equals 180 degrees.

A triangle with angles labeled A, B, and C, shown being rearranged into a straight line to demonstrate the sum of interior angles equals 180 degrees.

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