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egyptianking
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PostSubject: CArtesian Plane   Tue Jan 06, 2009 6:38 pm

What is a cartesian plane and its parts?????
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PostSubject: Re: CArtesian Plane   Thu Jan 08, 2009 8:55 pm

In mathematics, the Cartesian coordinate system (also called rectangular coordinate system) is used to determine each point uniquely in a plane through two numbers, usually called the x-coordinate or abscissa and the y-coordinate or ordinate of the point. To define the coordinates, two perpendicular directed lines (the x-axis, and the y-axis), are specified, as well as the unit length, which is marked off on the two axes (see Figure 1). Cartesian coordinate systems are also used in space (where three coordinates are used) and in higher dimensions.


Using the Cartesian coordinate system, geometric shapes (such as curves) can be described by algebraic equations,
namely equations satisfied by the coordinates of the points lying on
the shape. For example, the circle of radius 2 may be described by the
equation x2 + y2 = 4

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