construct a quadrilateral ABCD in which angle AB=3.5 CM, angle BC=6.5 CM, angle A=60°, angle C=120°and angle D=75°
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A+b+c+d=360
60+b+120+75=360
255+b=360
B=360-255
Angle B= 105
60+b+120+75=360
255+b=360
B=360-255
Angle B= 105
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