PERIMETER GRADE 3. Hello, How are you doing? Today, we are going to start a new lesson on.

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Presentation transcript:

PERIMETER GRADE 3

Hello, How are you doing? Today, we are going to start a new lesson on Perimeter.

Perimeter Perimeter is defined as the distance around an object or shape.

Rules to find the perimeter Rule 1:Measure the length of all sides of the shape. Rule 2:Add all the measured sides of the shape. The sum of all the sides gives the perimeter.

Example: Find the perimeter of the given rectangle. Perimeter of the given rectangle is = = 32 cm 5 cm 11 cm

Perimeter of square Perimeter of the shape when all the sides of the shape are equal = 4 x length of side Example – Perimeter of square 4 cm Perimeter of square = 4 x side = 4 x 4 = 16 cm

Perimeter  Perimeter obeys Commutative property of addition.  Perimeter of the rectangle does not change if the lengths of the sides are added in a different order.

Find the perimeter of the hexagon given below. Answer- 18 cm 3 cm

Important Tips  Two different polygons can have the same perimeter.  Perimeter can be calculated only of the closed figure.

13 match sticks are used to make a hut on the paper. If each match stick is 3 cm long, what is the perimeter of the hut?

What is the perimeter of the given figure? a) 36 cm b) 22 cm c) 28 cm d) None of these 5 cm 2 cm

The perimeter of the figure given below is 152 cm. Find the missing side. 6 cm 40 cm 11 cm

If each side of pentagon is 8 cm, what is the perimeter of the pentagon?

The Perimeter of the small room is 140 feet. If the room is rectangular shape and it is 40 feet wide. Find the length of the room.

ASSESSMENT

1.What is the perimeter of the equilateral triangle with side of 8 cm?

2.How much ribbon is required to move it around the outer boundary of the figure given below? 6 cm 4 cm 3 cm

3.If each centimeter of the ribbon costs $0.05, how much does it cost for the ribbon? (problem #2)

4.If the Perimeter of the square garden is 64 cm. What is the side of the perimeter?

5.Lara’s garden is 13 ft long and 9 ft wide. She wants to put a fence around it. How much fencing will Lara need?

6.How can you find the perimeter of a rhombus if the length of one side of rhombus is p cm? a) 4 x p cm b) 4 + p cm c) 4 – p cm d) None of these

7.Find the perimeter of the figure given below (trapezium). 9 cm 12 cm 5 cm

8.A small square box drawn on graph paper is 4 units long on each side. How many little squares are inside the square?

9.Pope ran twice around the square park of side 7 m. How much distance did he cover?

10.Find the Perimeter of the given figure. 8 cm 6cm 4 cm 2 cm

Recap  Perimeter  Rules to find Perimeter  Commutative property of Addition  Important Tips  Solved Examples  Practice Problems

Well Done! Now Practice worksheets on the lesson.