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##### Asked by: Elio Grunbeck

science physics# How do you work out perimeter from area?

Last Updated: 12th April, 2020

**Perimeter of a Rectangle**

- Remember the formula for
**perimeter**and**area**of arectangle. The**area**of a rectangle is a = length * width,while the**perimeter**is p = (2 * length) + (2 * width) - Substitute the known values into the
**area**formula. 36 =4 * w. - Substitute values for length and width into the
**perimeter**formula.

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Consequently, how do you find the perimeter when given the area?

**Method 2** **Calculating the Perimeter When Area isKnown**

- Know the formula for the area of a square. The area of anyrectangle (remember, squares are special rectangles) is defined asits base times its height.
- Find the square root of the area.
- Multiply the side length by 4 to find the perimeter.

Furthermore, how do you work out the area? The simplest (and most commonly used) **area**calculations are for squares and rectangles. To **find** the**area** of a rectangle multiply its height by its width. For asquare you only need to **find** the length of one of the sides(as each side is the same length) and then multiply this by itselfto **find** the **area**.

Also to know, how do you calculate a perimeter?

To **find** the **perimeter** of a rectangle, addthe lengths of the rectangle's four sides. If you have only thewidth and the height, then you can easily **find** all foursides (two sides are each equal to the height and the other twosides are equal to the width). Multiply both the height and widthby two and add the results.

How do you work out the perimeter of a room?

Measure the length and the width of a square orrectangular **room**. Use the standard 2(Length + Width) =**Perimeter** formula **to find the perimeter of a room**.Using a measuring tape, **find** the length and width of the**room**. Add the length and the width, then multiply the answerby two.