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2014-10-26T09:53:50+05:30

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To check if length is directly proportional to to area or perimeter, we need to divide area and perimeter by length. if we get a constant, then it is directly proportional, otherwise not.

See the attachment. It is clear that perimeter is directly proportional to length with proportionality constant 4.
1 5 1
Thanks you gave me 10 marks for my exam
you are welcome :)