10.3 Circumference of a Circle

10.3 Circumference of a Circle Objective: Find the circumference of a circle. Joseph Williams GESD jwilliams@gesd40.org Image: 'Olive oil bubble variations' www.flickr.com/photos/21649179@N00/2141140776 1

What part of the circle does he draw? Image: 'tips' www.flickr.com/photos/78364563@N00/13553883 2

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 3

Center The point inside a circle that is the same distance from all the points on a circle. 4

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 5

Diameter the distance across the circle through its center. Image: 'blood orange' www.flickr.com/photos/33602849@N00/2262073 6

Circumference the distance around a circle (the perimeter of a circle). Image: 'blood orange' www.flickr.com/photos/33602849@N00/2262073 7

pi the ratio of the circumference of a circle to its diameter. (3.14) Image: 'Pi sculpture' www.flickr.com/photos/35034351734@N01/21582841 8

Diagram of a Circle Radius Diameter Center Circumference 9

Label Each Circle Center Radius Diameter Circumference 10

Multiplying Decimals 1. Line up the numbers. 2. Multiply like you would any other number. 3. Count over for your decimal place in your answer. Image: 'Blue power3' www.flickr.com/photos/73491156@N00/391970523 11

Finding Circumference 5 C = 2 r C = 2 3.14 5 C = 31.4 12 C = d C = 3.14 12 C = 37.68 12

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10.3 Circumference of a Circle

by mrwilliams on Feb 04, 2008

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10.3 Circumference of a Circle — Presentation Transcript