Update index.html

Author: Gmac4247

index.html

@@ -3403,7 +3403,7 @@ <h4 itemprop="description">The volume of a cone can be calculated by algebraical
 <br><br>
 The 1 / 3 coefficient was likely estimated based on the observation that the area of the mid-height cross section of a cone — of which's apex can be connected to the midpoint of the base with a perpendicular line — is exactly a quarter of a circumscribed cylinder's with the same base and height.
 <br>
-That makes the ratio between the mid-height cross-sectional area of the cone, and the difference between the mid-height cross-sectional areas of the circumscribed cylinder and the pyramid 1 : 3 .</p>
+That makes the ratio between the mid-height cross-sectional area of the cone, and the difference between the mid-height cross-sectional areas of the circumscribed cylinder and the cone 1 : 3 .</p>
 <br>
 <math xmlns="http://www.w3.org/1998/Math/MathML" >
 <mrow>