Sunday, January 20, 2013

How do we define circles?

What is a circle?
A circle is the set of all points in a plane at a given distance from a given point. The given distance is a radius and the given point is a center.

Chord
A line segment that connects two points on a circle


Diameter
A line segment that goes through the center of a circle with endpoints on the circle. It is also the longest chord in the circle.

Tangent
A line segment that touches exactly one point  on a circle. Two circles can be a tangent at the same line and point.
 


Arc
A portion of the circumference of a circle.



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