Update index.html

HTML structure

Author: Gmac4247

index.html

@@ -2090,7 +2090,6 @@ <h3 style="margin:7px">Area of a regular polygon</h3>
 <br>
 <br>
 <br>
-<div>
 <section id="circle">
 <h3 style="margin:7px">
 The area of a circle is defined by comparing it to a square since that is the base of area calculation.
@@ -2629,6 +2628,7 @@ <h3 style="margin:7px">
 </math>
 <br>
 <br>
+<div>
 <label style="margin:12px" for="circle-radius-a">Radius:</label>
 <input id="circle-radius-a" type="number" value="1" step="any">
 <script>