* Create a function called `calculateArea()` that takes one argument, the
 * diameter of a circle. The function should return the area of the circle,
 * with 4 decimals.
 *
 * Answer with the result if the diameter is 17. ( hint: `pi()` )
 *
 * Write your code below and put the answer into the variable ANSWER.
 */

function calculateArea($arg1)
{
    $area = PI() * ($arg1 ** 2) / 4;
    $with4decimals = round($area, 4);
    return  'hint:  ' . $with4decimals;
 }


$ANSWER = calculatedArea(17);