In TODO 1 your task is to complete the body of the circle_area function with the radius parameter. Implement the body of the function to return the area of a circle given the radius provided as an argument. In case you are not sure how to compute the area of a circle, feel free to consult the relevant Wikipedia entry. For pi use 3.14. Below are several examples of the expected behavior: > circle_area(1) 3.14 >> circle_area(2.5) 19.625 > circle_area(0) 0.0