Prove that if the two arms of an angle are perpendicular to the two arms of another ange then the angles are either equal to the supplementry
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In this case: BA is parallel to ED and BC is transversal
therefore, ∠ABC= ∠1 [corresponding angles]
again , FE is parallel to BC and ED is transversal
therefore, ∠DEF= ∠1 [alternate interior angles]
hence, ∠ABC= ∠DEF
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