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Sum of the exterior angles of convex polygon

More elegant way to find the sum of the exterior angles of a convex polygon

Sum of interior angles of a polygon

Showing a generalized way to find the sum of the interior angles of any polygon

Proof: Corresponding angle equivalence implies parallel lines

Proof by contradiction that corresponding angle equivalence implies parallel lines

Proof: Sum of measures of angles in a triangle are 180

Proof that the sum of the measures of the angles in a triangle are 180