Perimeter

 Perimeter

Watch the video clip below to learn more about perimeter.

Video 1

FOLLOW UP PRACTICE ACTIVITIES

Activity 1

Activity 2

Activity 3

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Activity 5

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Activity 10

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Activity 12

Try the following

What is the perimeter of a rectangle with a length of 5 cm and a width of 3 cm?

a) 8 cm

b) 12 cm

c) 16 cm

d) 20 cm

Sarah wants to fence her rectangular garden, which is 8 meters long and 6 meters wide. What is the total length of fencing she needs?

a) 12 meters

b) 20 meters

c) 28 meters

d) 40 meters

If the perimeter of an equilateral triangle is 18 cm, what is the length of each side?

a) 4 cm

b) 6 cm

c) 9 cm

d) 12 cm

A garden in the shape of a rectangle has a length of 12 meters and a width of 7 meters. What is the perimeter of the garden?

a) 14 meters

b) 26 meters

c) 38 meters

d) 48 meters

Jane wants to put a ribbon around the edge of her rectangular gift box. If the box measures 10 cm by 6 cm, how much ribbon does she need?

a) 12 cm

b) 22 cm

c) 32 cm

d) 52 cm

A pentagon has five sides, each measuring 8 cm. What is the perimeter of the pentagon?

a) 8 cm

b) 16 cm

c) 24 cm

d) 40 cm

If the perimeter of a square is 36 cm, what is the length of each side?

a) 6 cm

b) 9 cm

c) 12 cm

d) 18 cm

Jack has a rectangular swimming pool measuring 20 meters by 10 meters. He wants to install a fence around it. How much fencing does he need?

a) 30 meters

b) 40 meters

c) 50 meters

d) 60 meters

Title: Exploring Perimeter with Polygons              Date: ________________________________

Grade Level: Year 3 (ages 7-8)

Duration: 5 sessions, approximately 45 minutes each

Objective: Students will be able to measure and compute the perimeter of various polygons.

Materials:

·         Paper

·         Pencils

·         Rulers

·         Various manipulatives (e.g., string, blocks, measuring tapes)

·         Whiteboard and markers

·         Worksheets or activity sheets

·         Projector

·         Teacher’s Blogsite

Day  1: Introduction to Perimeter

Engage: Students will be introduced to the lesson with a poem entitled “Perimeter Parade”. A discussion will ensue as to what the poem is about .which will lead to the concept Perimeter. Show examples of different shapes (e.g., square, rectangle, triangle) and ask students to identify the perimeter.

Explore:

·         Have students watch a video clip on perimeter from teacher’s bogsite to find out more about Perimeter.

·         Provide students with various shapes made from string or drawing on paper.

·         In pairs, have students measure the perimeter of each shape using rulers.

·         Encourage them to discuss their findings and compare measurements.

Explain: Discuss the concept of perimeter as the total length around the outside of a shape.

Elaborate: In groups, have students create their own shapes using manipulatives or draw them on paper. They should then measure and calculate the perimeter of each shape.

Evaluate: Ask students to share their findings with the class. Discuss any challenges they faced and clarify any misconceptions.

 

Day  2: Perimeter of Rectangles and Squares

Engage: Begin by reviewing the concept of perimeter from the previous session. Display various rectangles and squares on the board.

Explore:

·         In pairs, provide students with rectangles and squares of different sizes.

·         Have them measure the length of each side and calculate the perimeter by adding the sides..

·         Encourage them to record their measurements and calculations.

Explain: Discuss the similarities and differences between rectangles and squares. Emphasize that squares have equal sides, while rectangles have pairs of equal sides.

Elaborate: Divide the class into teams and provide each team with a large sheet of paper. Challenge them to draw as many rectangles and squares as they can within a time limit. Then, have them calculate the perimeter of each shape.

Evaluate: Review the calculations together as a class. Discuss any patterns or strategies students used to find the perimeter of each shape.

 

Day  3: Perimeter of Triangles

Engage: Start by reviewing the concept of perimeter and discussing its application to triangles.

Explore:

·         Provide students with various triangles (e.g., equilateral, isosceles, scalene).

·         In pairs, have them measure the length of each side and calculate the perimeter of each triangle.

·         Encourage them to record their measurements and calculations.

Explain: Discuss the characteristics of different types of triangles and how they affect perimeter calculations.

Elaborate: Challenge students to create triangles using manipulatives or drawing them on paper. Then, have them measure and calculate the perimeter of each triangle.

Evaluate: Review the calculations together as a class. Discuss any challenges students faced and strategies they used to overcome them.

 

Day  4: Perimeter of Irregular Polygons

Engage: Begin by discussing what makes a polygon irregular and how it differs from regular polygons.

Explore:

·         Provide students with various irregular polygons.

·         In pairs, have them measure the length of each side and calculate the perimeter of each irregular polygon.

·         Encourage them to record their measurements and calculations.

Explain: Discuss the challenges of calculating the perimeter of irregular polygons compared to regular polygons.

Elaborate: Challenge students to create their own irregular polygons using manipulatives or drawing them on paper. Then, have them measure and calculate the perimeter of each shape.

Evaluate: Review the calculations together as a class. Discuss any strategies students used to find the perimeter of irregular polygons.

 

Day  5: Real-World Applications

Engage: Start by discussing real-world examples where understanding perimeter is important (e.g., fencing a garden, measuring the length of a room).

Explore:

·         Provide students with scenarios involving real-world objects or situations.

·         In pairs or small groups, have them calculate the perimeter of each scenario.

·         Encourage them to explain their reasoning and discuss any challenges they encounter.

Explain: Discuss the importance of perimeter in everyday life and how it relates to measurement and problem-solving.

Elaborate: Challenge students to come up with their own real-world scenarios where understanding perimeter is important. They can present their scenarios to the class and explain how they would calculate the perimeter in each situation.

Evaluate: Assess students' understanding by reviewing their calculations and explanations. Provide feedback and address any remaining questions or misconceptions.

 

 Perimeter Parade

In a land of shapes, oh so neat,

Lived squares, triangles, and circles, complete.

They danced and twirled, so full of glee,

But one word puzzled them, 'perimeter', you see.

"It's the path around us," said Square with a smile,

"The length of our edges, let's measure in style!"

So off they went, with rulers in hand,

To explore the edges of their magical land.

Around the square, they walked with delight,

Counting each side, oh, what a sight!

Four sides equal, they found with cheer,

And when added together, the perimeter's clear!

Then came Triangle, with corners three,

"Let's measure around, come on, follow me!"

They traced each side, all different in size,

But together they made a perimeter surprise!

Curious Circle joined, rolling along,

"I'm round, not straight, but I'll join your song!"

They found the circle's edge, a roundabout way,

A special formula made the perimeter sway!

So now you know, in this playful rhyme,

Perimeter's the path, every single time.

Around the shape, a journey so grand,

Measuring edges, hand in hand.

With squares, triangles, and circles, hooray!

Let's dance with perimeter, come what may!

In the land of shapes, where joy never ends,

Perimeter's our guide, our magical friends.