Perimeter Of Rectangle - Definition, Formula, Examples

Safalta expert Published by: Yashaswi More Updated Thu, 24 Feb 2022 11:44 AM IST

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One of the most significant equations of the rectangle is the perimeter of the rectangle. It's the whole distance a rectangle covers around its perimeter. Many geometric forms and sizes with an area, perimeter, and even volume will be encountered in Math (for 3-d figures). You'll also learn all of the parameters' formulae. Circle, square, polygon, quadrilateral, and other shapes are examples of diverse shapes.

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In this post, we'll look at the perimeter of a rectangle, which is its most important aspect.  Join Safalta School Online and prepare for Board Exams under the guidance of our expert faculty. Our online school aims to help students prepare for Board Exams by ensuring that students have conceptual clarity in all the subjects and are able to score their maximum in the exams.

The term "perimeter" refers to the length of a figure. Assume that the perimeter of a square with all of its sides equals four times the square's sides. In the case of a circle, the perimeter is termed as circumference, which is calculated based on its radius. Before we find out the perimeter of a given rectangle, let us learn first, what a rectangle is. A rectangle is a quadrilateral that has two pairs of parallel sides equal and all the four angles at the vertices are right angles.



Table Of Contents-
1. What is Perimeter Of A Rectangle?
2. Perimeter of Rectangle Formula
3. Derivation Of Perimeter of Rectangle
4. Applications of Perimeter of a Rectangle


 

What is Perimeter of Rectangle?

The perimeter of a rectangle is the total distance covered by its boundaries or the sides. Since there are four sides of a rectangle, thus, the perimeter of the rectangle will be the sum of all four sides. Since the perimeter is a linear measure, therefore, the unit of the perimeter of rectangle will be in meters, centimeters, inches, feet, etc.

 

Perimeter of a Rectangle Formula

The perimeter of a rectangle is defined as the sum of all the sides of a rectangle. For any polygon, the perimeter are the total distance around its sides. In case of a rectangle, the opposite sides of a rectangle are equal and so, the perimeter will be twice the width of the rectangle plus twice the length of the rectangle and it is denoted by the alphabet “p”. Let us derive the formula for its perimeter and area.

Suppose a rectangle has length and width as b and a, respectively.

From the definition of the perimeter we know, the perimeter of a rectangle, P = 2 ( a+b) units

where

“a” is the length of the rectangle

“b” is the breadth of the rectangle


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Derivation of Perimeter of Rectangle

Since the perimeter is equal to the sum of all the sides of the polygon. Hence, in the case of a rectangle, the perimeter (P) is;
 

P = sum of all its four sides

P = a + b + a + b   (Opposite sides of rectangle are equal)

P = 2(a + b)

Hence, derived.
 

Therefore,

Perimeter of a rectangle = 2(Length + Width) square units

 

Now let us write the formula for the area of a rectangle, with respect to same above given figure;

Area of a rectangle = Length × Width = a × b
 
 

Applications of Perimeter of Rectangle

There are many real-life applications of the perimeter of a rectangle. A few of them are listed below:

  • We can determine the length of a rectangular field or a garden for its fencing using the perimeter formula
  • It can be used for many art and craft projects such as decorating the border of rectangular cardboard with colourful ribbons or ropes
  • For the construction of a rectangular swimming pool, the length of swimming races are defined by the perimeter
  • For the construction plan of the house, we need to set a boundary using concrete that is possible by perimeter formula




 

Solved Examples on Perimeter of Rectangle

 

Q.1: Find the perimeter of a rectangle whose length and width are 5 cm and 10 cm, respectively.

Solution: Given:

Length = 5 cm and Width = 10 cm

We know,

The perimeter of a rectangle = 2(length + width)

Substitute the value of length and width here,

Perimeter, P = 2(5 + 10) cm

P = 2 x 15 cm

Therefore, the perimeter of a rectangle = 30 cm
 

Q.2: Find the perimeter of a rectangle whose length and breadth are 12 cm and 15 cm, respectively.

Solution:

Given:

Length = 12 cm and Breadth = 15 cm

We know,

The perimeter of a rectangle = 2(length + width)

Substitute the value of length and width here,

Perimeter, P = 2(12 + 15) cm

P = 2 x 27 cm

Therefore, the perimeter of a rectangle = 54 cm
 

Q.3: A rectangular yard has length equals to 10 cm and perimeter equals to 60 cm. Find its width.

Solution: Given,

Perimeter of the yard = 60 cm

Length of the yard = 10 cm

Let W be the width of the yard.

From the formula, we know,

Perimeter, P = 2(length + width)

Substituting the values, we get;

60 = 2(10 + width)

10 + W = 30

W = 30 – 10 = 20

Hence, the width of the yard is 20cm.
 

Q.4: Find the perimeter of a rectangle whose length is 9 cm and width is 16 cm.

Solution:

Given,

Length = 9 cm

Width = 16 cm

Perimeter of Rectangle= 2(Length + Width)

= 2(9 + 16) cm

= 2 x 25 cm

Therefore, the perimeter of a rectangle= 50 cm

What is the area and perimeter of a rectangle?

The area of a rectangle can be defined as the region that the rectangle covers in a two-dimensional space. The area of a rectangle can also be defined as the number of square units it takes to completely fill the rectangle. The perimeter of a rectangle is defined as the total distance around the outside of a rectangle. In simple words, a rectangle’s perimeter is the total boundary of it.

How to find the perimeter of a rectangle?

To get the perimeter of a rectangle, add all the sides of it. There are 4 sides of a rectangle whose sum will give its perimeter.

How do you find the dimensions of a rectangle if you know the area and perimeter?

Find the dimensions of a rectangle with perimeter 100 m whose area is as large as possible.

  1. Explanation: Let 'A' be area and 'P' be perimeter of the rectangle. Let 'x' be the width and 'y' be the length. ...
  2. Perimeter = 2 (length + breadth) Hence, P = 2(x+y) ...
  3. Area of a rectangle = Length × Breadth.

What is a formula of perimeter of rectangle?

The perimeter of a rectangle is the total length of all the sides of the rectangle. Hence, we can find the perimeter by adding all four sides of a rectangle. ... The perimeter of the above rectangle with sides 'a units' and 'b units' is: a + b + a + b = 2a + 2b = 2 (a + b) units.

How do you find the perimeter of two rectangles?

Once you've added the length and width of your rectangle together, you can find its perimeter by multiplying by two.

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