Perimeter of a Rectangle with Given Area Calculator

Created by Vishnuvardhan Shakthibala
Reviewed by Aleksandra Zając, MD
Last updated: Sep 27, 2022

Are you looking to calculate the perimeter of a rectangle with a given area and a side? Then, you are in the right place. Our calculator will assist you in finding the perimeter of a rectangle right away. After inserting the area A and a side Side 1 (this is the side known to you), our calculator will give you the perimeter P.

Please read on to learn more about:

  • The perimeter of a rectangle;
  • Equations to find the perimeter of a rectangle; and
  • Other calculators that will help you answer any questions related to a rectangle.

What is the perimeter of a rectangle?

The perimeter is a quantity that measures the total length of 2-D or 3-D geometry's outer boundary: measurement starts from one point (say point z) and ends at the same point (point z). A rectangle is closed by four perpendicular sides, and two of them are unique. The perimeter of a rectangle equation is P=(a+b+a+b), which is basically a measure of all sides. In a simplified form: P=2×(a+b).

How to use this perimeter of a rectangle with given area calculator?

To use our calculator, follow the below points:

  • First, you should know area A and at least one side of the rectangle;
  • Insert the area value and known side value inside Area (A) and Side 1 (a) fields;
  • Once inserted, our calculator provides you with the missing side Side 2 (b) and the perimeter of the rectangle P.
  • Hurray! We believe now you can use our perimeter of a rectangle with given area calculator to find the perimeter of a rectangle quickly. If you are looking for ways to find every possible parameter related to a rectangle, you should check the next section.

FAQ

How do you find the perimeter of a rectangle given area?

You can use the following points to find the perimeter of a rectangle given area:

  • You need to know at least one side of the rectangle: call it Side 1;
  • Now use the area equation, i.e., A=Side 1 × Side 2 to find the unknown side Side 2; and
  • Finally, use Side 1 and Side 2 to find the perimeter, i.e., P=2×(a+b).
  • Awesome! Now you know how to find the perimeter of a rectangle. Use our perimeter of a rectangle with given area calculator to get the perimeter at supersonic speed!

How can you calculate the perimeter of a rectangle whose area is 20 m^2 and length is 4 m?

To find the perimeter:

  • Find the width w by diving the area A=20 cm^2^ by length l =4 cm, i.e., w=20/4=5; and
  • Once you get the width (w), the perimeter is calculated as P=2×(w+l)=2×(5+4)=20 m.

What is the difference between the area and perimeter of a rectangle?

The difference between area and perimeter are as follows:

  • The area is a quantity that shows how much space a geometry occupies, whereas the perimeter gives us the measurement of the total length of the outer boundary of the geometry;
  • The area of a rectangle equation is A=length×width, and the perimeter of a rectangle equation is P=2×(length+width).
  • SI unit of area is m2, and for perimeter, it is m.

What is the perimeter of a rectangle 11m x 5m?

The perimeter of this rectangle is 32 m. 11 m and 5 m are the length and width of a rectangle, respectively. Knowing length and width, you can calculate perimeter as P=2×(11+5)=32.

Vishnuvardhan Shakthibala
Image of a rectangle with sides a and b, diagonal d, perimeter and area marked.
Area (A)
in²
Side 1 (a)
in
Side 2 (b)
in
Perimeter (P)
in
Check out 22 similar 2d geometry calculators 📏
AreaArea of a rectangleArea of crescent… 19 more
People also viewed…

Helium balloons

Wondering how many helium balloons it would take to lift you up in the air? Try this helium balloons calculator! 🎈

Secretary problem (Valentine's day)

Use the dating theory calculator to enhance your chances of picking the best lifetime partner.

Supplementary angles

Supplementary angles calculator allows you to find the supplementary angle to the one you know . Also, you can check whether two angles are supplementary or not.

Triangle vertices

This triangle vertices calculator will help you find the coordinates of the vertices of a triangle using the coordinates of the midpoints.
Copyright by Omni Calculator sp. z o.o.
Privacy policy & cookies
main background