It is a system of counting in 60s. Very common in Babylonian times, it survives in our current measurement of time and of angles. An hour or degree are divided into 60 minutes and each of these is divided into 60 seconds.
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It is the Cartesian plane or grid system whereas coordinates of x and y are plotted on it.
The x-and the y-axes of the two dimensional Cartesian coordinate system divide the plane in four. Each of these is a quadrant.
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2240 lbs = 1 ton ( IMperial System) 2000 lbs = 1 ton ( American System).
The parts of a cartesian coordinate system include the origin (point 0,0), the x-axis or abscissa, the y-axis or ordinate, and the quadrants into which the x and y axes divide the plane.