Rectangle Calculator
A rectangle is defined as a closed twodimensional figure with four sides and four corners. The length of the opposite sides is equal and parallel to each other.
What is Rectangle Calculator?
'Cuemath's Rectangle Calculator' is an online tool that helps to calculate the value of the area, perimeter, and diagonal of the rectangle. Cuemath's Rectangle Calculator helps you to calculate the value of the area, perimeter, and diagonal of the rectangle within a few seconds.
How to Use Rectangle Calculator?
Please follow the steps below on how to use the calculator:
 Step 1: Choose a dropdown list to find the value of the area, perimeter, and diagonal of the rectangle.
 Step 2: Enter the values in the input box.
 Step 3: Click on the "Calculate" button to find the value of the area, perimeter, and diagonal of the rectangle.
 Step 4: Click on the "Reset" button to clear the field and enter the new value.
How to Find Area, Perimeter and Diagonal of Rectangle?
The area of a rectangle is the area occupied by the boundary of a square. It is measured in square units. The formula to calculate the area of a rectangle is given by:
Area of the rectangle = (length × width) square units.
The perimeter of a rectangle is defined as the total length or distance of its boundary on all sides. As opposite sides are equal. The formula to calculate the perimeter of a rectangle is:
Perimeter of a rectangle = 2(Length + width) units
Diagonal of a rectangle: In a rectangle, the lengths of opposite sides are equal. The length of a diagonal is calculated by the Pythagoras theorem.
Diagonal of a rectangle = √( l^{2} + w^{2})
Solved Examples on Rectangle Calculator

Example1:
Find the area of a rectangle whose side length is 7 units and whose width is 6 units.
Solution:
Given: Length = 7 and width = 6units
The formula for the area of a rectangle is:
Area = length × width
= 7 × 6
= 42 square units

Example2:
Find the perimeter of a rectangle whose length is 5 units and whose width is 6 units
Solution:
Perimeter of a rectangle = 2(length + width)
= 2(5 + 6)
= 22 units.

Example3:
Find the diagonal of a rectangle whose length is 6 units and whose width is 7 units
Solution:
Diagonal of a rectangle = √( l^{2} + w^{2})
=√6^{2}^{} × 7^{2}
=9.21 units.
Similarly, you can use the calculator to find the area, perimeter, and diagonal of a rectangle for the following:
 Length = 16 units and width = 17 units
 Length = 9 units and width = 5 units
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