Question: Write a function called circle_area, which is passed the radius r of a circle and returns the circle's area. Remember that the area of a

Write a function called circle_area, which is passed the radius r of a circle and returns the circle's area. Remember that the area of a circle of radius r is (pi)r^2. For example:

>>> circle_area(1)

3.14159265358793 # pi

>>> circle_area(2.5)

19.634954084936208 # pi*2.5

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