find the sizes of the angle of a parallelogram if one angle is 20 degree less than twice the smallest angle
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opposite angles are equal in parallelogram
A=C AND B=D
adjacent angles are supplementary
A+B=180 AND C+D=180
In parallelogram
A+B+C+D=180
2A+2B=180
A+B=90
B-20+B=90
2B=70
B=35=D
A=C=180-35=145
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