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Visual proof that the sum of angles in a triangle equals 180 degrees.

A triangle with angles labeled A, B, and C is shown being rearranged to form a straight line, demonstrating that the sum of the interior angles of a triangle is 180 degrees.

A triangle with angles labeled A, B, and C is shown being rearranged to form a straight line, demonstrating that the sum of the interior angles of a triangle is 180 degrees.

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