Python includes many useful modules that are just an import away. The math module is extremely useful in computing mathematical expressions in Python. Suppose we want to very accurately compute the area of a circle with a given radius. (Here's the link if you don't remember the formuta).
Get the radius as an input from the user Notice that we need the constant pl which is roughly 3.14 Conveniently, the math module has p defined for us as math. pi Use it to compute the area.
Output the resulting area with five digits after the decimal point.

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