posted by abhishek .
If the perimeter of a parallelogram is 140 m, the distance between a pair of opposite sides is 7 meters and its area is 210 sq m, find the length of two adjacent sides of the parallelogram.
Since you have the height = 7, the area is base * height = 210 = 7b
so, b=30, one of the two sides.
The perimiter = 2a+2b = 2a + 60 = 140, so a = 40
The sides are 30 and 40