if the side of a triangle is extended, the exterior angles so formed is equal to the sum of the interior opposite angles.Prove this...
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Theorem 2: If any side of a triangle is extended, then the exterior angle so formed is the sum of the two opposite interior angles of the triangle. In the given figure, the side BC of ∆ABC is extended. The exterior angle ∠ACD so formed is the sum of measures of ∠ABC and ∠CAB.
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