Perimeter

Perimeter

By MICHOLE PHIPPS

​The formula for perimeter is

2 x length +2 x width or length + length + width + width

​How do I find the perimeter of a rectangle?

​

​Solve: Length + Length + width +width

​

6 + 6 + 5 +5 =

12 + 10 = 22​

Solve :

2 x length + 2 x width

​2 x 6 + 2 x 5=

12 + 10 = 22cm

​

​

Solve

What is the perimeter of the shape below?

​Remember: 2 x length + 2 x width.

OR

​

length + length + width + width​

​

​

Solve: Did you get it correct

What is the perimeter of the shape below?

​14 X 2 + 6 X 2 =

28+12= 40​

​

OR

​

14+14+6+6 =40​

​

​

If it is a square, ALL side lengths are the same size.

So, you will use the same formula. 2 x length + 2 x width

2 x 5 + 2 x 5=

10+ 10=20​

​

​

What if the shape is a square and we are only given one side length?​

5

If it is a square, ALL side lengths are the same size.

So, you will use the same formula. 2 x length + 2 x width

2 x 5 + 2 x 5=

10+ 10=20​

​

​

What if the shape is a square and we are only given one side length?​

5

5

5

5

Solve

What is the perimeter of the shape below?

​Remember: If given the side length of a square, all of the side lengths are the same.

Some text here about the topic of discussion

7

Solve: Did you get it correct?

What is the perimeter of the shape below?

​Remember: If given the side length of a square, all of the side lengths are the same.

Some text here about the topic of discussion

7

2 x 7 + 2 x 7 or

7+7+7+7= 28​

7

​7

​7

Multiple Choice

What is the perimeter of the rectangle?

• 30

• 50

• 54

• 15

Multiple Choice

What is the perimeter of the rectangle?

• 28

• 11

• 22

• 16

Multiple Choice

What is the perimeter of the rectangle?

• 7

• 46

• 23

• 30

Multiple Choice

Find the perimeter of the following shape.

• 22

• 121

• 11

• 44

Multiple Choice

Find the perimeter of the following shape.

• 96

• 48

• 24

• 200

Multiple Choice

Find the perimeter of the following shape.

• 81

• 18

• 36

• 27

​Click to the next slide to reveal the steps.

Finding the Missing Side Length?​ Perimeter

​

The perimeter of the rectangle is 56 cm. What is the measurement of the missing side length?

​12

Finding the Missing Side Length?​ Perimeter

​

Step 1: Look at what is given. We can see that one side length is 12. So, we know the other side length is 12 also.

​12

​12

Finding the Missing Side Length?​ Perimeter

​

Step 2 : Add the 2 side lengths together.

​

12 + 12 = 24

​

​12

​12

Finding the Missing Side Length?​ Perimeter

​

Step 3 : Now, Since the total perimeter is 56. We must subtract 24 from 56.

​

This will give us what is leftover and we will be able to find the missing side length.

​

56-24 = 32​

​

​12

​12

Finding the Missing Side Length?​ Perimeter

​

Step 4 :Now we know we have 32 leftover after subtracting 24 from 56.

​

56-24 = 32 (Total of both side lengths)​

​

BUT DO NOT STOP THERE!

​

This number tells us the total for both side lengths.​

​

​12

​12

Finding the Missing Side Length?​ Perimeter

​

​12

​12

​16

​16

Solve: Find the missing side length

​The perimeter of the rectangle is 74 cm.

Some text here about the topic of discussion

​17

Solve: Find the missing side length

​The perimeter of the rectangle is 74 cm.

Some text here about the topic of discussion

​17

20

​Was your answer 20?

Multiple Choice

The perimeter of the rectangle is 82. What is the missing side length?

• 36

• 92

• 46

• 18

Multiple Choice

The perimeter of the rectangle is 74. What is the missing side length?

• 44

• 26

• 52

• 69

Multiple Choice

The perimeter of the rectangle is 30. What is the missing side length?

• 49

• 28

• 16

• 8