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Straight Talk About Circles

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Anatomy of A Circle

Anatomy of A Circle

  • Diameter (D) is the distance across a circle, measured directly over the center.
  • Radius (R) is the distance from a point on a circle to the center. Radius equals half the diameter.
  • Circumference (C) is the distance around the circle. To calculate circumference, just multiply the diameter times p.
  • Area (A) is the number of square inches (or feet or centimeters or whatever unit you're using) contained in the circle. To figure the area, square the circle's radius (multiply it by itself); then multiply the result times p.


Comments (5)
booker brooks wrote:

A paint can - you have many sizes in your shop - set on the wood until each side is the same distance from the corner, will have you going is super fast time. No paint cans, use water glasses or anything that is round in your view. Nuff said.

2/26/2010 12:10:54 PM Report Abuse
2ward2 wrote:

The beauty of the demonstrated method, based on high school geometry, is that any size circular arc can be generated. The other suggestions either limit the arc to a "popular" size or require a separate template for each size. Using a compass can get you close enough to use a jig saw etc., then plane/sand off the remainder.

2/26/2010 10:24:28 AM Report Abuse
southernwayok wrote:

they also have a thing called a circle template that you set over the corner and draw the line.

2/26/2010 09:25:52 AM Report Abuse
acf3838 wrote:

to cut radius with a router I made conner pieces wiht radius cut on one end only an a stop clip on the other conner,1/2",3/4",1", 1-1/2" are the most popular size,just clamp over the conner use a router bit with a top bearing works great every time an fast.Fred

2/25/2010 03:46:45 PM Report Abuse
mrtilly wrote:

For a 1" radius corner you could run a 1" mark parallel to each edge and put the piont of the compass where the lines cross to swing the corner arc.

2/25/2010 10:24:03 AM Report Abuse

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