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Write a script that will prompt the user for the length and width of a rectangle,
call function perimarea to calculate and return the perimeter and area, and print
the result. for simplicity the function ignores units and error-checking.
hint: write the formulas in the function perimarea first that will calculate
the perimeter and area of a rectangle. decide what would be the input
arguments and what would be the output arguments of the function.

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Write a script that will prompt the user for the length and width of a rectangle,
call functio...
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