if the perimeter of a parallelogram is 140 metre, the distance between a pair of opposite sides is 7 metre and its area is 210 square metre, find the length of two adjacent sides of the parallelogram
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area=BH= b*7=210
b=30
perimeter=2(b+a)=140
30+a=70
a=40
b=30
perimeter=2(b+a)=140
30+a=70
a=40
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