Geometry of Circles

1. A circle is 360 degrees.
2. The DIAMETER is a line that passes through the center of the circle.
3. The RADIUS is one-half of the diameter.
4. The CIRCUMFERENCE of a circle is the diameter times pi (3.14).
5. The AREA OF A CIRCLE is the radius squared times 3.14 (pi).
6. The VOLUME OF A CYLINDER  is pi (3.14) times the radious squred
   times the height of the cylinder.
7. A ARC is a section of a circle, like a slice of pie.
8. To find the area of a sector (like a slice of pie),
   compare the ratio of the number of degrees in the arc
   to the number of degrees in the circle:
         arc/360 =  a/radius squared time 3.14