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Demonstrating the sum of angles in a triangle by cutting and rearranging into a semicircle.

A diagram showing the process of cutting a triangle into three sectors labeled A, B, and C, and rearranging them into a semicircle to demonstrate the sum of angles in a triangle.

A diagram showing the process of cutting a triangle into three sectors labeled A, B, and C, and rearranging them into a semicircle to demonstrate the sum of angles in a triangle.

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