at right angles dCalculate the unknown(s) in each of the following:117 – InterviewSolution

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1.	at right angles dCalculate the unknown(s) in each of the following:117°300r"40°
Answer» we make eq 117= k+30+40, vertically opposite angle, we get k= 47 then for r we use sum of Angle in straight line so r+30+40+47=180 so r is 180-117 =63 so r= k = 63 as they are vertically opposite angle.

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