html - The code gives a parse error I can't find what the error is

Question

The code gives a parse error I can't find what the error is, the curlys brackets aren't wrong I'm trying to model the equation, v = sqrtfrac{19.6mass}{Cd1.229*area}

<?php
  function terminalVelocity($mass,$cd,$area) {

  $velocity = (sqrt(19.6 * $mass / $cd * 1.229 * $area));
  return $volume;
}

if ($_POST['enter']) {
  $mass = ($_POST['mass']);
  $area = ($_POST['area']);
  $cd = ($_POST['cd']);

  if ($mass > 0 && $front > 0) {
    $result = terminalVelocity($mass,$cd,$area);
    echo "The terminal velocity of the is: ". round($result,2);
} else {
    echo "You must have a value for each input";
}
?>

Answer 1

if ($_POST['enter']) {
  $mass = ($_POST['mass']);
  $area = ($_POST['area']);
  $cd = ($_POST['cd']);

  if ($mass > 0 && $front > 0) {
    $result = terminalVelocity($mass,$cd,$area);
    echo "The terminal velocity of the is: ". round($result,2);
} else {
    echo "You must have a value for each input";
}

The number of {s compared with }s doesn't match. Try:

if ($_POST['enter']) {
  $mass = ($_POST['mass']);
  $area = ($_POST['area']);
  $cd = ($_POST['cd']);

  if ($mass > 0 && $front > 0) {
    $result = terminalVelocity($mass,$cd,$area);
    echo "The terminal velocity of the is: ". round($result,2);
  }
} else {
    echo "You must have a value for each input";
}