State and prove that the sum of the interior angle of the triangles is 180 Project
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Construction: Draw a line PQ parallel to side BC of the given triangle and passing through point A. Thus, the sum of the interior angles of a triangle is 180°. Theorem: If any one side of a triangle is produced then the exterior angle so formed is equal to the sum of two interior opposite angles.
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The sum of three angles of any type of triangle is 180° or two right angles.
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