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Perimeter of a Square

LAST UPDATE: January 30th, 2022

Method #1 – Perimeter from Length or Width

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Formula – How to calculate the perimeter of a rectangle using the length

Perimeter = Length of one side x 4

Example

A square has a side with the length of 10 inches.

Perimeter = 10 inches x 4 = 40 inches

Method #2 – Perimeter from Area

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Formula – How to calculate the perimeter of a rectangle from the area

Perimeter = 4 x √Area

Example

A square has an area of 100.

Perimeter = 4 x √100 = 4 x 10 = 40

Method #3 – Perimeter from the Diagonal

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Formula – How to calculate the perimeter of a square from the diagonal

Perimeter = 4 x (√(diagonal2 ÷ 2))

Example

A square has a diagonal with a length of 14.

Perimeter = 4 x (√(142 ÷ 2))

Perimeter = 4 x (√(196 ÷ 2))

Perimeter = 4 x √98

Perimeter = 4 x 9.899

Perimeter = 39.596