10. If two straight lines intersect each other in such a way that one of the angles formed measures 90°, show that each of the remaining angles measures 90 degree.
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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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∠AOC = 90°
We know that,the vertical angles which are created by the intersection of two straight lines, are equal.
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