Method #1 – Length from Area
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Formula – How to calculate the length of a square using the area
Length = √Area
Example
A square has an area of 100.
Length = √100 = 10
Method #2 – Length from Perimeter
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Formula – How to calculate the length of a square from the perimeter
Length = Perimeter ÷ 4
Example
A square has a perimeter of 40.
Length = 40 ÷ 4 = 10
Method #3 – Length from the diagonal
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Formula – How to calculate the length (or width) of a square using the diagonal
Length = √(Diagonal2 ÷ 2)
Example
A square has a diagonal length of 14.
Length = √(142÷ 2)
Length = √(196 ÷ 2)
Length = √98
Length = 9.899