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OpenStudy (anonymous):

A quadrilateral has three angles that measure 90o , 100o, and 120o. Which is the measure of the fourth angle? Select one of the options below as your answer:A. 40o B. 50o C. 90o D. 100o

OpenStudy (anonymous):

sum of all four angles of a quadrilateral is 360 degree so 90 deg + 100 deg + 120 deg + fourth angle = 360 deg so fourth angle = 360 deg - 310 deg = 50 degree

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