a</code> The known area of the object.</p></li>
<li><p><code>perimeter</code> The known perimeter of the object.</p></li>
<li><p><code>radius_mean</code> The known radius of the object.</p></li>
<li><p><code>radius_min</code> The known minimum radius of the object. If the object is a
square, then the <code>radius_min</code> of such object will be <code>L/2</code> where <code>L</code> is the
length of the square side.</p></li>
<li><p><code>radius_max</code> The known maximum radius of the object. If the obje