title: Is there a way to have pi in a CSS calc?
body: <p>I have an SVG circle animation for a progress bar where the <code>stroke-dashoffset</code> is animated from <code>0,radius</code> to <code>radius,0</code> (for 0% to 100%). </p>
  
  <p>The equation for the length of the circumference of a circle is <code>pi * d</code>. Is there a way to use a CSS <code>calc</code> function where it can use a value of pi, rather than just a rounded value (like 3.14)?</p>