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2014-09-26T08:07:01+05:30
SEE THE ATTACHMENT FOR THE ABOVE QUESTION
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2014-09-29T04:58:41+05:30

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Angle AOC = exterior angle of triangle AOE
                   = angle EAO + angle AEO
                   = A/2 + exterior angle of triangle EBC
                  = A/2 + B + C/2 = B + (A+B)/2
                   = 90 + 90/2 = 135 degrees
A+B = 90 as ABC is a right angle triangle

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