Perimeter of Rectangle
The perimeter of a rectangle is the length of the outer boundary of a rectangle. It can be taken as the sum of the total measure of the length and breadth of the rectangle. Some of the daily life examples of a rectangle are the flat surface of a sleeping cot, a photographic frame, a textbook, a dining table, or a pencil box.
As per definition, the perimeter of a rectangle is equal to twice the sum of the length and the breadth of the rectangle. The perimeter of a rectangle is a linear measure and has the same units of length. Quite often we find figures in our daily life, in the shape of a rectangle. To understand rectangles in a better way, we need to know more about the dimensions and the calculations related to the perimeter and area of a rectangle.
1.  What is the Perimeter of a Rectangle? 
2.  Formula for Perimeter of a Rectangle 
3.  How to Find the Perimeter of a Rectangle? 
4.  Usage of Perimeter of a Rectangle 
5.  FAQs on Perimeter of a Rectangle 
What is the Perimeter of a Rectangle?
The perimeter of a rectangle is the total length or distance of its boundary on all sides. The perimeter of a rectangle is a linear measure and has the same linear unit of meters, feet, inches, or yards. Let us first understand the two main properties of a rectangle.
 All four angles of a rectangle are 90°.
 Opposite sides of a rectangle are equal in measure.
Imagine a rectangular park in your neighborhood. Have you ever thought about how long its boundary is?
If you go around the park along its boundary once, you cover a distance. This distance is the perimeter of the park. In order to measure the perimeter of any rectangular field, you travel along the boundary of the four sides of the field. You begin at a fixed point called the starting point and end when you reach the starting point again. This length or distance of the boundary is called the perimeter of a rectangle.
Formula for Perimeter of a Rectangle
The formula used to calculate the perimeter of a rectangle is, perimeter of a rectangle = 2(L + B) units, where 'L' is the length and 'B' is the breadth of a rectangle. Let us understand this with the help of a simple example. David wants to put a fence around his farm so that his sheep will not wander away. Let us now understand this formula with an example. He wants to know how much wire he would need to put a fence around his rectangular farm.
Let us first name the sides of his farm. The larger side of this rectangular farm is named (l). The smaller side is named (b). Now, if we add the distance of all 4 sides of his farm, it will give us the perimeter. Total distance = l + b + l + b = 2l + 2b. Therefore, the Perimeter of the rectangle = 2(l + b) units.
How to Find the Perimeter of a Rectangle?
The perimeter of a rectangle can be calculated in three simple steps. The following three steps are helpful to find the perimeter.
 Step 1: To calculate the perimeter of a rectangle, the length, and breadth should be known.
 Step 2: The respective values of length and breadth are substituted in the formula.
 Step 3: After solving the equation, the value of the perimeter is calculated.
The formula used to calculate the perimeter of a rectangle is: Perimeter of a rectangle = 2(L + B). If the perimeter and the length of a rectangle are known, the breadth can be calculated using the formula: Breadth = P/2  L, where L= length of the rectangle; and B = breadth of the rectangle, and P = perimeter of the rectangle. In the same way, if the perimeter and the breadth are known, the length can be calculated using the formula: Length(L) = P/2  B. Where P= perimeter of the rectangle; and B = breadth of the rectangle.
Usage of Perimeter of a Rectangle
The Perimeter of a rectangle makes things easier and helps us in calculating distances and lengths in our daytoday lives.
For example,

If you need to decorate the border of your rectangular notebook, you can easily calculate how much ribbon you would need by finding the perimeter.

If you need to put a fence around your garden, the perimeter of the garden will give you the exact length of wire you would need.
Can you think of other similar examples related to the perimeter of a rectangle?

Example 1: Ann wants to add some lace as decoration to the borders of her bedsheet. The bedsheet is in the shape of a rectangle. The length of the bedsheet is 120 inches and the breadth is 85 inches. How much lace will she need to put around it?
Solution:
Given length l is 120 inches; breadth b is 85 inches We know that the perimeter of a rectangle is equal to twice the sum of its length and breadth. Hence Perimeter of a rectangle = 2(l+b). Applying the values of length and breadth in this formula we have Perimeter = 2(l+b) = 2 (120 + 85)= 2 × 205 = 410 inches.
Therefore Ann will need 410 inches of lace.

Example 2: Your favorite chocolate bar is made up of equalsized squares with each side measuring 1 inch. Calculate the perimeter of the bar.
Solution:
We know that each little square has all its sides equal to 1 inch. If we count and add the sides of the squares along the length of the bar, we get 6 inches. The sides of squares along the breadth of the bar add up to 2 inches. Therefore, the length of the bar is 6 inches and the Breadth of the bar is 2 inches. Applying this in the perimeter formula we have.
Perimeter} = 2(l+b)= 2 (6+2) = 2×8 = 16 inches
Therefore the perimeter is 16 inches.
FAQs on Perimeter of a Rectangle
What are the Properties of a Rectangle?
The basic properties of a rectangle are:
 The opposite sides are parallel and equal.
 All the angles are equal to 90°.
 The diagonals are equal and they bisect each other.
What is the Formula for the Area of a Rectangle?
The area of a rectangle is the space occupied by the rectangle. Area of a rectangle is the product of its length and breadth. The formula for calculating the area of a rectangle is: Area = L × B; where (L) is the length and (B) is the breadth of the rectangle.
How to Find the Perimeter of a Rectangle?
The perimeter of a rectangle is twice the sum of its length and breadth. Perimeter = 2(Length + Breadth) units. Perimeter is the sum of the lengths of the boundaries of the rectangle. Hence the perimeter of a rectangle has the same units as the length of the rectangle.
What Are the Units of Perimeter of a Rectangle?
The units of the perimeter of a rectangle are the same as its length and the units are equal to meters, cms, inches, or yards. The perimeter is equal to the sum of the outer lengths of the rectangle. Perimeter = Length + Length + Breadth + Breadth = 2Length + 2Breadth = 2(Length + Breadth) units.
Is the Area and Perimeter of a Rectangle the Same?
No. The area and the perimeter of a rectangle are different. The area is expressed in square units and the perimeter is expressed in linear units. The area is the product of the length and the breadth of the rectangle. And the perimeter is the sum of the lengths and breadths of the rectangle.
What Is the Perimeter of the Rectangle, When Given the Area?
For the given area of the rectangle, we need to know either the length or the breadth of the rectangle to know the other dimension of the rectangle = Area = L × B. B = Area /L. Now applying this value in the Perimeter = 2(L + B) we have Perimeter = 2(L + Area/L) units.
How to Find Area of a Rectangle in Terms of Perimeter?
For the given perimeter of a rectangle, the value of length can be found for the given breadth of the rectangle. P = 2(L + B), B = P/2  L. Applying this in the area of a rectangle formula we have. Area = L × B , Area = L(P/2  B). Hence the area of a rectangle can be found if the perimeter and the breadth of the rectangle are known.