The Measure Of The Three Angles Of Quadrilateral Are 120 Degree, 110 Degree, And 70 Degree, What Is The Measure Of The Fourth Angle?

The sum of the angles of a quadrilateral is 360o.
120o + 110o + 70o + a = 360o
a = (360 - 300)o = 60o    (subtract the sum of the given angles from both sides of the equation)

The measure of the fourth angle is 60o
Three angles of a quadrilateral measure 35 ,125,and 85 degrees . Write and solve an equation to find the weigh of the fourth angle

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