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Circles: Area and Circumference

by Emily Hauck

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Circles: Area and Circumference
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By- Emily Hauck
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Table of Contents
Pg. 3
Parts of a Circle
Rounded Rectangle
Pg. 7
You try finding the area
Rounded Rectangle
Pg. 4
Finding Circumference
Rounded Rectangle
Pg. 8
Video for extra help
Rounded Rectangle
Pg. 5
You try finding Circumference
Rounded Rectangle
Pg. 9 
References
Rounded Rectangle
Pg. 6
Finding the area
Rounded Rectangle
Parts of a circle
- Area- Area enclosed by a circle
- Circumference- The linear distance around it. 
- Radius- The distance from the center of the circle to any point on its circumference. 
- Diameter- The length of the line through the center that touches two points on the edge of the circle. 
- Pi (π )-The ratio of the circumference of any circle to the diameter of that circle (3.14). 
Finding the Circumference
You try finding the Circumference!
Formula:
C=πd or C=2πr
Example 1:
d=12
C=πd
C=π(12)
C=12π
Ellipse;
Example 2:
Ellipse;
r=2
C=2πr
C=2π(2)
C=4π
listen how to do examples 1 and 2
You try finding the Circumference!
Example 3:
Ellipse;
d=20
Example 4:
r=6
listen how to do examples 1 and 2
Ellipse;
Finding the Area
Formula:
A=πr^2
You try finding the Area!
Example 1:
Ellipse;
r=10
A=πr^2
A=π(10)^2
A=100π
Example 2:
Ellipse;
r=6
A=πr^2
A=π(6)^2
A=36π
listen how to do examples 1 and 2
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