Area and Circumference of a Circle
Presentation
•
Mathematics
•
6th Grade
•
Practice Problem
•
Hard
Standards-aligned
Parker Kiser
Used 103+ times
FREE Resource
16 Slides • 4 Questions
1
Area and Circumference of a Circle
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3
Formulas for Circumference
(Know it but we won't really use it much.)
4
Using the Formula
Enter the formula (without the "C=" in Desmos.
Click enter/return.
Next you have to tell Desmos what the variable is. In this formula, the only variable is r (radius)
Type "r="
5
Using the Formula
Take a look at the problem. Find the radius.
Remember, if it gives you the diameter, you have to divide it by 2
Type that number next to "r="
6
Let's look at an example.
Find the circumference of the circle with a radius of 8.
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Circumference Example
Enter the formula (without the "C=" in Desmos.
Click enter/return.
Next you have to tell Desmos what the variable is. In this formula, the only variable is r (radius)
Type "r="
8
Circumference Example
Take a look at the problem. Find the radius.
In this example, the radius is 8.
Type 8 next to "r="
9
Circumference Example
AMAZING! Desmos does the work for you.
Round as necessary.
If you are working on a multiple choice assignment, look for the answer that is really close to what you get.
We are using , but some assignments may use 3.14 so you answer might not be exactly the same.
10
Fill in the Blanks
Type answer...
11
Fill in the Blanks
Type answer...
12
Formula Area
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Using the Formula
Everything works EXACTLY like it did when finding the circumference. You just use the area formula.
Enter the formula (without the "A=" in Desmos.
Click enter/return.
Next you have to tell Desmos what the variable is. In this formula, the only variable is r (radius)
Type "r="
14
Using the Formula
Take a look at the problem. Find the radius.
Remember, if it gives you the diameter, you have to divide it by 2
Type that number next to "r="
15
Let's look at an example.
Find the area of the circle with a radius of 8.
16
Area Example
Enter the formula (without the "A=" in Desmos.
Click enter/return.
Next you have to tell Desmos what the variable is. In this formula, the only variable is r (radius)
Type "r="
17
Area Example
Take a look at the problem. Find the radius.
In this example, the radius is 8.
Type 8 next to "r="
18
Area Example
Again, Desmos does the work for you.
Round as necessary.
If you are working on a multiple choice assignment, look for the answer that is really close to what you get.
We are using , but some assignments may use 3.14 so you answer might not be exactly the same.
19
Fill in the Blanks
Type answer...
20
Fill in the Blanks
Type answer...
Area and Circumference of a Circle
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