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Browse High School Conic Sections, Circles
Stars indicate particularly interesting answers or good places to begin browsing.

Selected answers to common questions:
    About ellipses.
    Find the center of a circle.
    Is a circle a polygon?
    Volume of a tank.
    Why is a circle 360 degrees?



Why is Pi a Constant? [08/01/2000]
Why is the circumference of a circle divided by the diameter, or pi, the same number for every circle?

Why Pi? [07/19/2002]
Instead of using pi, why don't we measure the radius and circumference of a given circle, and use that ratio to find the area? Wouldn't that be more accurate?

Woodworking Curve [02/06/2002]
I am making a cabinet and I want to put a curve on the front of the shelves. The "chord" of the circle would be 15" and a perpendicular line from the center point of the chord to the circumference of the circle is 1".

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