ABCD is a quadrilateral in which the bisectors of ∠B and ∠C meet at O.If ∠A=100° and ∠D=70°, find the measure of ∠BOC.
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Step-by-step explanation:
60°
Angles A+B+C+D =360
Therefore B+C = 240
In triangle BOC sum of angles is 180
B/2 + C/2 +O = 180
(B+C) /2 =120
BOC=60
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