/**
 * Exercise 1.8 (1 points)
 *
 * 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) {
    $c = pi() * pow(($arg1/2), 2);
    $with_4_decimals = round($c, 4);
    return 'hint: ' . $with_4_decimals;
 }





$ANSWER = calculateArea(17);

// I will now test your answer - change false to true to get a hint.
echo $dbwebb->assertEqual("1.8", $ANSWER, false);