Question

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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Answer 1

Answer:

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