Update about.html

Author: Gmac4247

about.html

@@ -594,7 +594,7 @@ <h2 style="font-size:160%;margin:7px;">The area of a circle is defined by compar
 </p>
 <br>
 <br>
-<p style="margin:12px;">Substituting 90° for 1/4:
+<p style="margin:12px;">Substituting 90°/360° for 1/4:
 <br>
 <br>
 <math xmlns="http://www.w3.org/1998/Math/MathML" >