Post on 06-Sep-2014
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Objective: Find the circumference of a circle.Joseph Williams GESD jwilliams@gesd40.org
10.3 Circumference of a Circle
Image: 'Olive oil bubble variations'www.flickr.com/photos/21649179@N00/2141140776
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What part of the circle does he draw?Image: 'tips'www.flickr.com/photos/78364563@N00/13553883
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Circle the set of all points in a plane that are the same distance from a point called the center.
Image: 'Olive oil bubble variations'www.flickr.com/photos/21649179@N00/2141150298
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Center The point inside a circle that is the same distance from all the points on a circle.
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Radius The distance from the center of a circle to any point on the circle.
Image: 'blood orange'www.flickr.com/photos/33602849@N00/2262073
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Image: 'blood orange'www.flickr.com/photos/33602849@N00/2262073
Diameter the distance across the circle through its center.
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Image: 'blood orange'www.flickr.com/photos/33602849@N00/2262073
Circumference the distance around a circle (the perimeter of a circle).
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pi the ratio of the circumference of a circle to its diameter. (3.14) Image: 'Pi sculpture'
www.flickr.com/photos/35034351734@N01/21582841
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Diagram of a Circle
Center
Diameter
Radius
Circumference
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Label Each Circle
Center Radius
Diameter Circumference
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Multiplying Decimals
Image: 'Blue power3'www.flickr.com/photos/73491156@N00/391970523
1. Line up the numbers.2. Multiply like you would any other number.3. Count over for your decimal place in your answer.
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Finding Circumference
C = 2 r
C = d
5C = 2 3.14 5
C = 31.4
12 C = 3.14 12C = 37.68