1.

In a quadrilateral ABCD the measure of three angles A, B, C are 110?, 70, 80 degrees then find the measure of the fourth angle D

Answer»

We know that the sum of all angles of a quadrilateral is EQUAL to 360
Then....
=> A+B+C+D=360
=> 110+70+80+D=360
=> 260+D=360
=> D =360-260
=> D =100

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