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Language/Type: PHP parameters return

Write a function named circle_area that accepts the radius of a circle as a parameter (as a Float) 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.

Hint: You can use the standard pi() function in PHP to get an approximate float value for Pi.

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

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