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You only need to know the length of one side. Knowing the side length (s) you can find the area (multiply s by s) and perimeter (multiply s by 4)
If the length of each side is s, then you add the lengths of the sides: s+s+s+s = 4s Muliplication is easier: the perimeter is 4 times s = 4s.
The answer is given below:
It depends on what B is and what S is!
To find the perimeter you add and to find the area we multiply.