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The sum of the interior angles of a triangle equals 180 degrees, as shown by rearranging the angles into a straight line.

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

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

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