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PERIMETER
GRADE 3
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Hello, How are you doing?Today, we are going to start a new lesson on
Perimeter.
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PerimeterPerimeter is defined as the distance around
an object or shape.
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Rules to find the perimeterRule 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.
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Example: Find the perimeter of the given rectangle.
Perimeter of the given rectangle is = 11 + 5 + 11 + 5= 32 cm
5 cm
11 cm
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Perimeter of squarePerimeter of the shape when all the sides of
the shape are equal = 4 x length of sideExample – Perimeter of square
4 cm
Perimeter of square = 4 x side
= 4 x 4
= 16 cm
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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.
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Find the perimeter of the hexagon given below.Answer- 18 cm
3 cm
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Important Tips Two different polygons can have the same
perimeter. Perimeter can be calculated only of the
closed figure.
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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?
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What is the perimeter of the given figure?a) 36 cmb) 22 cmc) 28 cmd) None of these
5 cm
2 cm
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The perimeter of the figure given below is 152 cm. Find the missing side.
6 cm
40 cm
11 cm
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If each side of pentagon is 8 cm, what is the perimeter of the pentagon?
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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.
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ASSESSMENT
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1. What is the perimeter of the equilateral triangle with side of 8 cm?
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2. How much ribbon is required to move it around the outer boundary of the figure given below?
6 cm
4 cm
3 cm
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3. If each centimeter of the ribbon costs $0.05, how much does it cost for the ribbon? (problem #2)
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4. If the Perimeter of the square garden is 64 cm. What is the side of the perimeter?
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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?
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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 cmb) 4 + p cmc) 4 – p cmd) None of these
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7. Find the perimeter of the figure given below (trapezium).
9 cm
12 cm
5 cm
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8. A small square box drawn on graph paper is 4 units long on each side. How many little squares are inside the square?
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9. Pope ran twice around the square park of side 7 m. How much distance did he cover?
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10. Find the Perimeter of the given figure.
8 cm
6cm
4 cm
4 cm
2 cm
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Recap Perimeter Rules to find Perimeter Commutative property of Addition Important Tips Solved Examples Practice Problems
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Well Done!Now Practice worksheets on the lesson.
