The exterior angle is \(180 - 108 = 72^\circ\). Key fact The sum of interior angles in a triangle is 180°. To find the sum of interior angles of a polygon, multiply the number of triangles in the ...
To find the sum of interior angles in a polygon ... If the side of a polygon is extended, the angle formed outside the polygon is the exterior angle. The sum of the exterior angles of a polygon ...
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