Perimeter of Rectilinear Shapes - for kids

Calculate Perimeter of Rectilinear Shapes – for kids

As a student when first time we listen PERIMETER, it’s not obvious to us as what is
this used for or why we need to study this.

In this vlog we will learn about Perimeter and check with some examples how perimeter can be useful.

Let’s Begin

What is Perimeter?

Simply saying, If we start from one point of rectilinear shape and move along the path and reach the same point. Path traced is called the perimeter of the rectilinear shape.

Rectangle-Perimeter-vlogboard Square-Perimeter-vlogboard

Mathematically if we sum up all sides of a rectilinear shape, result will be the perimeter of the shape.

Let’s check this with some examples.

EXAMPLE 1:
Consider a rectilinear shape of 4 sides say a SQUARE.Square-SidesHere sides of a Square ABCD are AB, BC, CD, DA.

If I put my pencil on point A and go to B on line AB, then from B to C, C to D and finally D to point A.

I traced the Perimeter of Square.

As we mentioned above, Perimeter is SUM of all sides of a rectilinear shape.

Perimeter of Square = AB + BC + CD + DA

Let’s understand this by using some values.square-sides-valueAs shown in figure, Side of square is 2 meter each.

So AB = 2m, BC = 2m, CD = 2m, DA = 2m

Perimeter of Square is SUM of it’s side

Perimeter of Square = AB + BC + CD + DA

Putting the values of it’s respective sides, we get

Perimeter of Square = 2 + 2 + 2 + 2
Perimeter of Square = 8 meters

EASY !

EXAMPLE 2:
Consider a rectilinear shape of 4 sides say a RECTANGLE.rectangle-sidesHere sides of a Rectangle ABCD are AB, BC, CD, DA.

If I put my pencil on point A and go to B on line AB, then from B to C, C to D and finally D to point A.

I traced the Perimeter of Rectangle.

As we mentioned above, Perimeter is SUM of all sides of a rectilinear shape.

Here, Perimeter of Rectangle = AB + BC + CD + DA

Let’s understand this by using some values.rectangle-sides-valueAs shown in figure, Sides of Rectangle are,

AB = 4m, BC = 2m, CD = 4m, DA = 2m

Perimeter of Rectangle is SUM of it’s side

Perimeter of Rectangle = AB + BC + CD + DA

Putting the values of it’s respective sides, we get

Perimeter of Rectangle = 4 + 2 + 4 + 2
Perimeter of Rectangle = 12 meters

EASY AGAIN !

Likewise, for any such rectilinear shape whether it has 4 sides, 5 sides or n number of sides. Perimeter can be calculated as sum of it’s sides.

How Perimeter can be used in daily life?

Say we have a square or rectangular park or of any rectilinear shape.

If we need to make wire boundary or fence around the park and we have to calculate the cost of the fencing or boundary.

Perimeter has to be calculated first.

Example

Say cost of fencing 1 meter is INR 50 and We have to calculate cost of fencing a Square Park of side 500 meter. It can be calculated as

FIRST, find perimeter of square which gives complete length of the park to be fenced with wire.

Perimeter of Square is sum or it’s 4 sides

so, P = 500 + 500 + 500 + 500

P = 2000 meters

Now cost of fencing 1 meter is INR 50

So Cost of fencing 2000 meters is INR 2000 x 50

Cost of fencing 2000 meters  = INR 100,000

Likewise, If I run around a Square park of length 200 meters and I take 5 rounds. We can easily find how much length I covered or ran.

First calculate perimeter of the Square i.e. sum all it’s sides.

Length covered in 1 round = 200 + 200 + 200 + 200

Length covered in 1 round = 800 meters

I take 5 rounds and here length of 1 round is 800 meters,

So Length covered in 5 rounds is  800 x 5

Length covered in 5 rounds = 4000 meters

Same way we can calculate for rectangle or other rectilinear shapes.


Do You Know?

Square – All sides of Square are same in dimension or size.
As you see in above example, AB = BC = CD = DA = 2 meters

Rectangle – Opposite sides of Rectangle are same in dimension or size.
As you see in above example,  AB = CD = 4 meters and BC = DA = 2 meters

We hope you understand the Perimeter of Rectilinear shape and how we can use it in daily life.

In the next vlog, we will see how to calculate Perimeter of Square and Rectangle.

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