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Example problem demonstrating the sum of angles in a triangle, where one angle is unknown.

A diagram illustrating the sum of angles in a triangle, showing a triangle ABC with angles labeled as 60 degrees, 55 degrees, and X degrees, with the formula ∠A + ∠B + ∠C = 180°.

A diagram illustrating the sum of angles in a triangle, showing a triangle ABC with angles labeled as 60 degrees, 55 degrees, and X degrees, with the formula ∠A + ∠B + ∠C = 180°.

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