Question: P.4(20 pts) An annulus is the region between two concentric circles. (1) Write out a parametric representation of an annulus with outer radius 2 and
P.4(20 pts) An annulus is the region between two concentric circles. (1) Write out a parametric representation of an annulus with outer radius 2 and inner radius 1; (2) Write out the rectangle representation (in terms of x and y) of the annulus.
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