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A parallelogram has a perimeter of 20 kilometers. Two of the sides are each 3 kilometers long. What is the length of each of the other two sides?

Answer :

The parallelogram has a perimeter of 20
2 sides = 3 each which means 6 total
20-6=16
16/2 for the other two sides = 8
So the lengths of all the sides are 8,3,8,3 kilometers