Angles of a quadrilateral (a four-sided figure) add up to 360 degrees.
Add up the given angles, along with the missing angle, and set equal to 360. x + 65 + 75 + 100 = 360 {added given angles and missing angle, and set equal to 360} x + 240 = 360 {combined like terms} x = 120 {subtracted 240 from each side} the measure of angle C is 120 Ask Algebra House
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