Question

collect information on the sum of interior angles of a triangle and the sum of interior angles of a quadrilateral

Answer 1

Proof: The sum of the measures of the interior angles of any quadrilateral can be found by breaking the quadrilateral into two triangles. Since the measure of the interior angles of any triangle equals 180 degrees, each of the two triangles will contribute 180 degrees to the total for the quadrilateral.

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