title: reverse square root: in a Math lib or how to calculate it
body: <p>Does Actionscript have a function that would tell me what number the input is a square root of. For example:</p>
  
  <pre><code>4     //output 2, because 4 is the square root of 2
  16    //output 4, because 16 is the square root of 4
  </code></pre>