Update index.html

Author: Gmac4247

index.html

@@ -2610,9 +2610,27 @@ <h3 itemprop="name" style="margin:7px">
 <br>
 <p itemprop="description" style="margin:12px">Which is equivalent to 1 = 1 .
 <br>
+<math style="margin:12px" xmlns="http://www.w3.org/1998/Math/MathML" >
+<mrow>
+<mi>Uncovered area</mi>
+<mo>=</mo>
+<mi>Overlapping area</mi>
+</mrow>
+</math>
+<br>
+<br>
+<br>
+<p itemprop="description" style="margin:12px">This is an identity; not tautology. 
+<br>
+<math style="margin:12px" xmlns="http://www.w3.org/1998/Math/MathML" >
+<mrow>
+<mi>Circle area</mi>
+<mo>=</mo>
+<mi>Square area</mi>
+</mrow>
+</math>
+<br>
 <br>
-Gap equals overlap. This is an identity; not tautology. 
-</p>
 <br>
 </details>
 </section>
@@ -4378,7 +4396,7 @@ <h3 itemprop="name" style="margin:7px">Volume of a Frustum Cone</h3>
 <br>
 <br>
 <br>
-<section itemscope itemtype="http://schema.org/CreativeWork" id="pyramid">
+<section itemscope itemtype="http://schema.org/CreativeWork" itemref="polygon" id="pyramid">
 <h3 itemprop="description" style="margin:7px">The volume of a pyramid can be calculated 
 with the same coefficient as the volume of a cone.</h3>
 <br>