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circle_area

Language/Type: C parameters return

Write a function named circle_area that accepts the radius of a circle as a parameter (as a real number) and returns the area of a circle with that radius. For example, the call of area(2.0) should return 12.566370614359172. You may assume that the radius passed is a non-negative number. Use the constant M_PI to approximate the value of π.

Function: Write a C function as described, not a complete program.

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