Three angles of a quadrilateral are 110 degree,50 degree and 40 degree. Find the measure of its fourth angle.
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the sum of all angles of quadrilateral is 360 dregree
therefore, 110 dregree + 50 degree + 40 dregree +. x =360 degree
therefore 200 degree + x = 360 degree
therefore, x= 360-200
therefore,x=160
the measure of fourth angles is 160 degree
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