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coordinate systems
In geometry, a coordinate system is a system that uses one or more numbers, or coordinates, to uniquely determine the position of the points or other geometric elements on a manifold such as Euclidean space. The order of the coordinates is significant, and they are sometimes identified by their position in an ordered tuple and sometimes by a letter, as in "the x-coordinate". The coordinates are taken to be real numbers in elementary mathematics, but may be complex numbers or elements of a more abstract system such as a commutative ring. The use of a coordinate system allows problems in geometry to be translated into problems about numbers and vice versa; this is the basis of analytic geometry.
Convert the Cartesian coordinate (9, -9,2) into cylindrical coordinates.
A. (9 sq. ft. of 2, 7n/4, 2)
B. (9 sq. rt. Of 2, 5n/4, 2)
C. (-9 sq. rt. Of 2, 3n/4, 2)
D. (-9 sq. ft. of 2, 7n/4, 2)