Write to ask the user input the width and length of a rectangle and then the area and the perimeter of this rectangle.

Write to ask the user input the width and length of a rectangle and then the area and the perimeter of this rectangle.

LANGUAGE:  PYTHON

CHALLENGE:

a)Write to ask the user input the width and length of a rectangle and then the area and the perimeter of this rectangle.

b) do the input validation to make sure that the user will not input a negative number.

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