If two straight lines intersect each other in such a way that one of the
anglés formed measures 90°, show that each of the remaining angles
measures 90°.
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According,to the data mentioned in the question one of the formed angles is 90°. ... Other three angles are = ∠AOC,∠AOD and ∠BOD. Now,AB is a straight line. So,the ∠AOB will be 180°
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