# Dimensions of a Rectangle Calculator

If you're wondering how to **find dimensions of a rectangle given area and perimeter,** do not fret — our **dimensions of a rectangle calculator** helps you find the dimensions of a rectangle right away.

If you want to know more about rectangles and how to find their dimensions, please continue to read the below article.

## What are the dimensions of the rectangle?

A rectangle is a **2-dimensional geometrical shape formed by four perpendicular sides**. Out of four sides, **two sides are unique**, and the other two sides are similar to the unique sides. **These two unique sides are the dimensions of a rectangle.**

## How to use our "Dimensions of a Rectangle Calculator"?

If you're unsure of how to use the "dimensions of a rectangle calculator", just follow these steps:

- Input the perimeter (
`P`

); - Input the area (
`A`

); and - Right away, you will get the dimensions of the rectangle.

## More calculators to tackle rectangles!

Now you know how to find the dimensions of a rectangle with a given perimeter and area. Below, we provide more calculators that deal with calculations of several rectangle-related parameters. We hope it will help you solve the challenges posed by rectangles!

- Area of a rectangle calculator
- Diagonal of a rectangle calculator
- Rectangle diagonal angle calculator
- Perimeter of a rectangle
- Surface area of a rectangle calculator
- Length of a rectangle calculator
- Width of a rectangle calculator
- Length and width of rectangle given area calculator
- Length and width of rectangle given perimeter calculator
- Perimeter of a rectangle with given area
- Rectangle scale factor calculator
- Square feet of a rectangle calculator
- Golden rectangle calculator

## FAQ

### How do you find the dimensions of a rectangle?

To find the dimensions of a rectangle:

- Rewrite the perimeter equation
`P = 2(a+b)`

in terms of one of the dimensions, like so:`b = P/2−a`

. - Now insert the above equation into the equation for the area (A):
- The area equation is given as
`A = a×b`

. - Substituting
`b`

inside`A = a×b`

, we get`A = a(P/2−a)`

.

- The area equation is given as
- Solve the quadratic equation
`a² − (P/2)×a + A = 0`

to get`a`

. - Find
`b`

using`b = P/2−a`

or`b = A/a`

. - Hurray! Now you know how to find the dimensions of a rectangle given area and perimeter.

### How do you find the dimensions of a square?

To find the dimensions of a square with side length `a`

:

- if you have the perimeter (
`P`

), write the perimeter equation`P = 4a`

in terms of the side length, as`a = P/4`

. - If you have the area (
`A`

), write the area equation`A = a²`

in terms of the side length, as`a = √A`

. - You can see that to find dimensions of a square, you just have to know either area (
`A`

) or perimeter (`P`

).

### How to find the dimensions of a square whose area is 20 m²?

To find the dimensions of a square with a given area, **you just have to take the square root of A**. Therefore, one of the dimensions of a square is

`a = √20 = 5 m`

.### What is the perimeter of a rectangle?

The perimeter (`P`

) of a rectangle is the sum of all the individual sides of a rectangle, i.e., `P = 2x(a+b)`

.