The other name for the rectangular coordinate system is the Cartesian coordinate system. You can remember it because cartography is the study of maps, which are generally rectangular.
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Rectangular cuboid
The first and second coordinate. X is the first coordinate and y is the second.
rectangular prism
No. In an ordered pair for a point in the xy-plane the first number is the x-coordinate and the second is the y-coordinate. (2, 5) is the point with an x-coordinate of 2 and a y-coordinate of 5; (5, 2) is the point with an x-coordinate of 5 and a y-coordinate of 2. Only if the x- and y- coordinates are equal are the points the same point. However, the point (5, 2) is the reflection of the point (2, 5) in the line y = x.
The best way to describe it unambiguously is calling it a rectangle based pyramid.