Area of Circles
Presentation
•
Mathematics
•
7th Grade
•
Practice Problem
•
Medium
+5
Standards-aligned
Molly Kinney
Used 4+ times
FREE Resource
34 Slides • 19 Questions
1
Area of a Circle
This lesson will follow the notes provided.
Please watch the videos, answer the questions, AND fill out the notes! Remember - the notes will be a part of the Unit 3 Notebook check!!
2
Watch the video. The captions are helpful!
3
Area of a Circle
4
Multiple Choice
The radius is from the center of a circle to one edge.
True
False
5
Fill in the Blanks
6
Circle 1
7
Next we need to find out what the radius is. This one is labeled r = 3 in.
We can also count the number of squares that are shaded from one edge to the center.
Circle 1
8
Circle 1
The () around the 3 squared are to show the 2 only works on that number. You do not square pi
9
Circle 1
10
Type
Circle 1
11
Circle 1
12
Sometimes you are not given boxes to count or a radius.
This question gives you a diameter.
When this happens divide the diameter by 2 to get the radius then continue like normal!
Circle 2
13
Fill in the Blanks
14
Circle 2
15
Multiple Choice
10 ÷ 2 =
12
8
20
5
16
Circle 2
17
Circle 2
18
Multiple Choice
5×5=
10
0
25
1
19
Circle 2
20
Circle 2
Yes I know the calculator says 78.53981634, not 78.54 but it is ok to round your answer to a smaller number..
In this question I rounded to the hundredths place, the number after 3 is 9, since 9 is bigger than 5 we round the 3 up to 4.
21
Multiple Choice
Round the number to the hundredths place
27.36475684
20
27.36
27.4
27.36475684
22
Try this one on your own while I walk you through it.
Do you have a radius or a diameter?
Circle 3
23
Fill in the Blanks
24
Write the formula for finding the area of a circle.
Next, replace what you know.
Hint you should know the radius.
Circle 3
25
Drag and Drop
26
Now simplify the exponent to write the area in terms of pi
Circle 3
27
Multiple Choice
What is the area in terms of π ?
A=12π
A=0π
A=36π
A=1π
28
Finally, multiply to find the area.
Circle 3
29
Math Response
What is the area of the circle?
30
These next few questions are for practice, they are not in your notes. You can write them on the next page or in the margins if you would like extra examples.
31
Dropdown
When I plug in what I know I have A =
In terms of π the area is
The area of the circle is
32
Fill in the Blanks
33
Multiple Choice
To find the radius I...
Add 2
Subtract 2
Multiply by 2
Divide by 2
34
Math Response
What is the area of the circle?
35
What happens when you know the area but not the radius?!
36
Look at the second notes sheet, #1.
A circle has an area of 78.5 square inches. What is the radius?
37
A circle has an area of 78.5 square inches. What is the radius?
38
A circle has an area of 78.5 square inches. What is the radius?
39
A circle has an area of 78.5 square inches. What is the radius?
To find a square root on the calculator click this then type in the number.
40
Multiple Choice
What number, multiplied by itself, will equal 25?
7
5
4
6
41
#2
A circular sprinkler system is installed and waters an area of 28.29 square yards.
What is the radius of the circle?
42
#2
A circular sprinkler system is installed and waters an area of 28.29 square yards.
What is the radius of the circle?
43
#2
A circular sprinkler system is installed and waters an area of 28.29 square yards.
What is the radius of the circle?
44
Multiple Choice
What number, when multiplied by itself is 9?
1
2
3
4
45
#2
A circular sprinkler system is installed and waters an area of 28.29 square yards.
What is the radius of the circle?
46
Drag and Drop
Jada is
47
This describes the perimeter of the circle, it is the line making the circle.
Circumference
This describes everything inside the circumference of the circle.
Area
48
Dropdown
The amount of fencing around a circular garden.
The amount of frosting needed to cover a cookie.
The amount of crust needed to cover a pie.
The distance traveled in one lap around a circular track.
49
5.
Two different trees are being planted in an outdoor garden. Each tree requires a specific amount of space for the roots to grow.
How much more space will tree II (two) require?
Start with what you know about both trees...
Tree II has a radius of 9 ft.
50
5.
Two different trees are being planted in an outdoor garden. Each tree requires a specific amount of space for the roots to grow.
How much more space will tree II (two) require?
What do you need to know?
How many more square feet will tree II need?
In other words
Area of tree II - Area of tree I
51
5.
Two different trees are being planted in an outdoor garden. Each tree requires a specific amount of space for the roots to grow.
How much more space will tree II (two) require?
Find the areas (plan and work)
52
5.
Two different trees are being planted in an outdoor garden. Each tree requires a specific amount of space for the roots to grow.
How much more space will tree II (two) require?
Solution (answer the question)
Area of Tree II - Area of Tree I = ?
254.47 - 201.06 = 53.41
53
Poll
On a scale of 1 - 5 how well do you understand how to find area of a circle?
(No wrong answers!)
1 - not at all and I read everything on here!
2 - a little bit
3 - meh kind of
4 - I have a question but I think I got it
5 - I totally got it!
Area of a Circle
This lesson will follow the notes provided.
Please watch the videos, answer the questions, AND fill out the notes! Remember - the notes will be a part of the Unit 3 Notebook check!!
Show answer
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