Update index.html

Fix

Author: Gmac4247

index.html

@@ -3999,7 +3999,7 @@ <h3 itemprop="name" style="margin:7px">Volume of a Cone</h3>
 </div>
 <br>
 <br>
-<section itemscope itemtype="http://schema.org/CreativeWork id="traditional_cone_volume>
+<section itemscope itemtype="http://schema.org/CreativeWork" id="traditional_cone_volume">
 <details>
   <summary>
 	<h4 itemprop="name" style="margin:7px">
@@ -4111,7 +4111,7 @@ <h3 itemprop="description" style="margin:12px">One is that the area of the mid-h
 <br>
 <br>
 <br>
-<section itemscope itemtype="http://schema.org/CreativeWork id="cube-dissection">
+<section itemscope itemtype="http://schema.org/CreativeWork" id="cube-dissection">
 <h3 itemprop="name" style="margin:12px">The other idea is the cube dissection.</h3>
 <br>
 <div class="imgbox">
@@ -4599,8 +4599,8 @@ <h3 itemprop="name" style="margin:7px">Volume of a horizontal Frustum Pyramid</h
 </div>
 <br>
 <br>
-<section itemscope itemtype="http://schema.org/CreativeWork" itemprop="square_frustum_volume" id="square_frustum">
-<h3 itemprop="description" style="margin:7px">The volume of a square frustum pyramid can be calculated via a simplified formula.
+<section itemscope itemtype="http://schema.org/CreativeWork" id="square_frustum">
+<h3 itemprop="name" style="margin:7px">The volume of a square frustum pyramid can be calculated via a simplified formula.
 </h3>
 <br>
 <math style="margin:12px" xmlns="http://www.w3.org/1998/Math/MathML" >