Update index.html

Author: Gmac4247

index.html

@@ -2730,7 +2730,6 @@ <h6 style="font-size:160%;margin:7px;">Area of a regular polygon</h6>
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 <p style="margin:12px;">The volume of a quarter cylinder with the same base, and height equal to the slant height of the cone would be 
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@@ -2766,7 +2765,6 @@ <h6 style="font-size:160%;margin:7px;">Area of a regular polygon</h6>
 The intermediate of the areas of the horizontal cross section slices of a cone is the half of a cylinder’s.
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