Fix typos

Advanced/Geometric Optimization/main.tex

@@ -170,7 +170,7 @@
 	\problem{}
 	Draw a circle, then draw two distinct tangents $\ell_1$ and $\ell_2$ that intersect at point $A$. \par
 	Let $P$ be a point on the circle between the tangents, and $BC$ be the tangent at that point.
-	Describe how $P$ shoud be selected in order to minimize the perimeter of triangle $ABC$.
+	Describe how $P$ should be selected in order to minimize the perimeter of triangle $ABC$.
 
 	\begin{center}
 		\begin{tikzpicture}[scale = 2]