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Perimeter

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The perimeter is the distance around an object. It is calculated by adding together all the lengths of an object.

Pri1 Pri2

What is a Polygon?

- It is a closed plane shape or figure

- It has straight sides

Some of the polygons are as follows:

Pri3

Example 1

  • Find the perimeter of the given square.

Pri4

To find the perimeter of the polygon, you would just add the length of all sides together.

So, the perimeter of this square is 7 + 7 + 7 + 7= 28 units

Remember: Perimeter of a polygon = sum of the length of all sides

Example 2

  • Ants are walking around your picnic mat as shown in the image given below. Measure the sides of the picnic mat and add them to find out how far the ants walked.

Pri5

The length and the width of the mat is 8 feet and 6 feet respectively. To find the perimeter, we need to add all the sides.

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The perimeter will be:

8 + 6 + 8 + 6 = 28

So, the perimeter of the picnic mat is 28 feet.

Example 3

  • While making a card for your parents you want to put yarn around the card. Measure the sides to find out how much yarn is required.

Pri7

The length and the width of the card is 6 inches and 4 inches respectively.

Pri8

The Perimeter of the card is:

6 + 4 + 4 + 6 = 20

So, 20 inches of yarn is required for the card.

Summary
  • The perimeter is the distance around an object. It is calculated by adding together all the lengths of an object.
  • The perimeter of a square is 4a.
  • Pri1

  • The perimeter of a rectangle is 2a + 2b
  • Pri2

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