Our rectangle area calculator finds the area, perimeter, and diagonal of a rectangle by considering its lengths and width. With the help of a maximum area of a rectangle calculator, you can find the area of the given coordinates of four corners of a rectangle as well.

## What Is a Rectangle?

**A rectangle is a type of quadrilateral with four sides, four corners, and four angles that are equal to 90 degrees. **

In a rectangle, the alternate sides are equal and parallel to each other.

## Area of a Rectangle Formula:

A rectangle is a four-sided polygon that has four angles of 90 degrees. By using the area of the rectangle calculator, you can find a rectangle's area, perimeter, and diagonal. The area of the rectangle formula is;

Area of a rectangle = L * W

Area of a rectangle = Length * Width

You can calculate the area of a rectangle with the help of the rectangle area calculator. It uses the following units to represent the area of a rectangle.

- mm^2
- cm^2
- dm^2
- m^2
- km^2
- in^2
- ft^2
- yd^2
- mi^2

## How To Find The Area Of a Rectangle?

The best feature of our rectangular area calculator is that if you have an area and want to calculate its length or width you can do so. Suppose that a rectangle has a length of 4cm and a width of 6cm. What is the area of a rectangle?

**Given Data:**

Length = 4cm

Width = 6cm

**To Find:**

Area = A =?

**The formula for area of a rectangle:**

A = l * w

**Put values in the formula to find an area of rectangle**

A = 4cm * 6cm

A = 24 cm^2

We can also find the length or width by adjusting the rectangle area formula as follows:

L = A/W

L= 24/6

L = 4cm

### Find The Perimeter of a Rectangle

Here we find the perimeter of the same rectangle that we suppose in the example. The equation for perimeter is;

P = a + b + a + b

Which can be written as

P = 2 (a + b)

P = 2 (4 + 6)

P = 10cm

### Find The Diagonal Of a Rectangle:

Calculate the diagonal of a rectangle for the same rectangle that we suppose upper. The diagonal of a rectangle formula is as follows;

d^2 = a^2 + b^2

Take a square root on both sides we get:

$$d = \sqrt{a^{2} + b^{2}}$$

a^2 = 16, b^2 = 24

a + b = 40

d = 40

d = 6.326cm

## Working of Rectangle Area Calculator:

Stay focused on the following points to understand the working of our area of shaded rectangle calculator.

**Input:**

- The length of one side of the rectangle
- Put the width of the rectangular side
- Choose a unit in which you want to calculate area
- Tap “Calculate”

**Output:**

- Area of rectangle
- Perimeter of a rectangle
- Diagonals
- Step-by-step calculations

## Properties Of a Rectangle:

There are several properties of a rectangle that are as follows:

- A rectangle is a quadrilateral
- It's center is equidistance from its vertices so it is circumcircle
- All corner angles are equal to each other
- It is rectilinear which means that all sides meet at 90 angles
- Opposite sides of the rectangle are equal and parallel to each other
- The sum of all angles is equal to the 360 degrees
- Each diagonal of the rectangle bisects the other
- Both opposite-sided diagonals have the same length

## FAQs:

### Is Square a Rectangle?

A square is always a rectangle and the rectangle is not always a square. The rectangle’s opposite sides are equal but parallel to each other. Their adjacent sides may or may not be equal. That's why always rectangles are not square.

### What Are The Golden Rectangles?

The rectangle whose side lengths are in a golden ratio. The formula to find the golden ratio of the rectangle is as follows:

**(a + b) / a = a / b = ϕ**

Where the value of ϕ is approximately 1.618.

## References:

From the source **Wikipedia:** Rectangle, Characterizations, Classification, Properties, Formulae, Theorems, Crossed rectangles, Other rectangles.

From the source **Khan Academy:** Area of rectangles review, what is an area?