10.3 Circumference of a Circle

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  • The formula for the circumference is 2*pi*r, since we're talking about 1/4 of a circle, the formula here is







    C = (1/4)*2*pi*r







    r is 10.3 feet



    C = (2/4)*pi*(10.3)







    Simplify and find C



    C = (1/2)pi(10.3)







    C is approximately 16.18 feet.



    ========================================================



    [URL='http://blog.widecircles.com '] widecircles[/URL]



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10.3 Circumference of a Circle

  1. 1.   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
  2. 2. What part of the circle does he draw? Image: 'tips' www.flickr.com/photos/78364563@N00/13553883 2
  3. 3. 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
  4. 4. Center ­ The point inside a circle that  is the same distance from all the points  on a circle. 4
  5. 5. 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
  6. 6. Diameter ­  the distance  across the  circle  through its  center. Image: 'blood orange' www.flickr.com/photos/33602849@N00/2262073 6
  7. 7. Circumference ­   the distance  around a circle  (the perimeter of a  circle). Image: 'blood orange' www.flickr.com/photos/33602849@N00/2262073 7
  8. 8. 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
  9. 9. Diagram of a Circle Radius Diameter Center Circumference 9
  10. 10. Label Each Circle Center Radius   Diameter Circumference 10
  11. 11. 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
  12. 12. 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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