The area of a circle is calculated using the formula Area $=(r^2)**,$ where $r$ is the circle's radius.

Given variable circle$\_$radius read from input and constant PI$,$ compute the area of a circle and assign circle$\_$area with the area.

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$\frac{?}{PI}=3\mathrm{.}14159$

circle$\_$radius $=$ float input $()$