18. Define the exterior angle property of a triangle?
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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. ... The exterior angle ∠ACD so formed is the sum of measures of ∠ABC and ∠CAB.
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An exterior angle of a triangle is equal to the sum of the two opposite interior angles. The sum of exterior angle and interior angle is equal to 180 degrees.
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