

And Perimeter
Presentation
•
Mathematics
•
3rd - 4th Grade
•
Hard
Joseph Anderson
FREE Resource
24 Slides • 8 Questions
1
Perimeter

2
3
4
Real-world Examples
How is perimeter used in everyday life?
5
Fences
We would need to know how much fence to put around a garden.
6
Swimming Pool
We need to know how much concrete to put around the pool.
7
Christmas lights
We often find the perimeter when putting up Christmas lights around the house.
8
Border
We find the perimeter of a room to figure out how much wallpaper border to put up.
9
Track and Field
Athletes use the perimeter of the track to run relays.
10
11
We can calculate the perimeter of this square by adding 5+5+5+5 or 5x4 ...
which equals 20.
12
13
STAAR Reference Chart
You can use the reference chart to use the formulas to find the perimeter of a square and rectangle.
14
Square Formula
Square P= 4s mean Perimeter = 4 X sides (There are 4 sides in a square and all sides are equal.)
15
Rectangle Formula
P = l + w + L + w means
Perimeter = length + width + length + width
-or-
P = 2l + 2w means
Perimeter = 2 times length + 2 times width
16
Let's answer some questions.
Ready?
17
Find the perimeter for this square and mark your answer on the next slide.
You can use the easy formula P = 4s
(P = 4 X ___ to get your answer.)
18
Multiple Choice
What is the perimeter of this square?
3 units
6 units
9 units
12 units
19
What is the perimeter of this triangle?
Be ready to answer on the next slide.
20
Multiple Choice
What's the perimeter of this triangle?
10 cm
11 cm
12 cm
13 cm
21
What's the perimeter of this triangle?
Be ready to answer on the next slide.
22
Multiple Choice
What's the perimeter of this triangle?
18 inches
18 feet
18 cm
23
What's the perimeter of this pentagon?
Be ready to choose your answer on the next slide.
24
Multiple Choice
What is the perimeter of this pentagon?
15 units
12 units
9 units
6 units
25
Let's challenge ourselves a little bit!
Not all of the sides are labeled.
You can still figure out the lengths of the unlabeled sides by looking at the sides on the opposite side.
Remember the formula to find the perimeter of a rectangle?
Hint: L = 7 in and w = 2 in
P= l + w + l + w
26
Multiple Choice
What is the perimeter of this shape?
11 inches
22inches
27
What's the perimeter of this rectangle?
28
Multiple Choice
What's the perimeter of this rectangle?
26 cm
27 cm
28 cm
29
Multiple Choice
What is the perimeter of this rectangle?
16 ft
8 ft
32 ft
30
LAST QUESTION!
31
Multiple Choice
28 in
7 in
14 in
32
Perimeter

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