# Circle

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```					           Circle

The set of points in a plane
at a given distance from a
given point in that plane
*The given point is the center
*The given distance is radius
* A segment with one endpoint the
center and the other endpoint on
the circle
* It is also the length of this
segment
* All radii of a circle are congruent
Chord
A segment whose
endpoints lie on a circle
Secant
A line that contains a
chord of a circle
Diameter
A chord that contains the
center of the circle
(Also refers to the length
of this segment)
Tangent
A line in the plane of a
circle that intersects the
circle in exactly one point,
called the point of
tangency
Sphere
The set of all points in
space that are a given
distance from a given
point
Congruent circles
Circles that have
Concentric circles
Circles that lie in the same
plane and have the same
center
A   polygon is inscribed in a circle if
all the vertices are on the circle
 A circle in circumscribed about
the polygon if each vertex of the
polygon lies on the circle
Great Circle
 The intersection of a sphere
with any plane passing
through the center of the
sphere.
Common Chord
Achord that is in each of
two distinct circles.

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 views: 3 posted: 7/27/2012 language: pages: 12