Update index.html

Gmac4247 · web-flow · commit d5d985947228 · 2025-08-09T17:44:38.000+02:00
diff --git a/index.html b/index.html
@@ -1952,6 +1952,7 @@ <h6 style="font-size:160%;margin:7px;">Area of a regular polygon</h6>
 <mn>4</mn>
 </mfrac>
 </mrow>
+</mrow>
 </math>
 <br>
 <br>
