Update index.html

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Author: Gmac4247

index.html

@@ -1852,7 +1852,7 @@ <h3 itemprop="name" style="margin:7px">Calculate the Area of a Circle</h3>
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-<p itemprop="abstract" style="margin:12px">The circle can be cut into four quadrants, each placed with their origin on the vertices of a square.
+<p itemprop="abstract">The circle can be cut into four quadrants, each placed with their origin on the vertices of a square.
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 In this layout the arcs of the quadrants of an inscribed circle would meet at the midpoints of the sides of the square, leaving some of the square uncovered. 
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