I think that formula for finding the perimeter of square is wrong.....

I think it should be [4*side] not [4*length]

l = length and s= side it means the same only

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you are right but the sides are also  length in case of square

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suyash jaiswal has given the right answer

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4(side)

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Yes, you can use the word side in place of l. You can use any notation which is convenient for you

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