In a quadrilateral ABCD, angle A = 120°, angle B = 60° and angle C =
70°. Find angle D.
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- sum of quadrilateral is 360 degree.
- a+b+c+d =360
- 120+60+70+d=360
- 250+d=360
- d=360-250
- d=110 degree
the answer of angle d is 110 degree.
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