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Signs of x and y values in a quadrant
In geometry, a quadrant is one of the four sections of a rectangular coordinate plane. The four quadrants make up the area contained by the x- and y-axes and are labeled I through IV, starting in the upper right quadrant and going counter clockwise, as shown in the figure below.
The diagram below shows the signs of coordinates in different quadrants.
The point where the x and y axes intersect in a 2-D Cartesian coordinate system called is called the origin

3-D shapes can also be represented on Cartesian Coordinate diagrams. Third axis is called z-axis and it is perpendicular to both the x- and y- axes
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