Update enclosing-circle.md (#1518)

mhayter · web-flow · commit 4d9d5e9caa03 · 2025-09-21T11:00:38.000+02:00
Minor errors spelling + n not defined
diff --git a/src/geometry/enclosing-circle.md b/src/geometry/enclosing-circle.md
@@ -60,6 +60,7 @@ bool inside(mec const& C, point p) {
 // Choose some good generator of randomness for the shuffle
 mt19937_64 gen(...);
 mec enclosing_circle(vector<point> &p) {
+    int n = p.size();
     ranges::shuffle(p, gen);
     auto C = mec{p[0], p[1]};
     for(int i = 0; i < n; i++) {
@@ -136,7 +137,7 @@ $$
 \angle azb + \angle bca
 $$
 
-In a [cyclic quadrilateral](https://en.wikipedia.org/wiki/Cyclic_quadrilateral), if $c$ and $z$ are from the same side of $ab$, then the angles are equal, and will ad up to $0^\circ$ when summed up signed (i.e. positive if counter-clockwise and negative if clockwise). Correspondingly, if $c$ and $z$ are on the opposite sides, the angles will add up to $180^\circ$.
+In a [cyclic quadrilateral](https://en.wikipedia.org/wiki/Cyclic_quadrilateral), if $c$ and $z$ are from the same side of $ab$, then the angles are equal, and will add up to $0^\circ$ when summed up signed (i.e. positive if counter-clockwise and negative if clockwise). Correspondingly, if $c$ and $z$ are on the opposite sides, the angles will add up to $180^\circ$.
 
 <center>
 <img src="https://upload.wikimedia.org/wikipedia/commons/3/30/Opposing_inscribed_angles.svg">
@@ -206,4 +207,4 @@ Now, we can finally ensure that everything works by submitting the problem to th
 ## Practice problems
 
 - [Library Checker - Minimum Enclosing Circle](https://judge.yosupo.jp/problem/minimum_enclosing_circle)
-- [BOI 2002 - Aliens](https://www.spoj.com/problems/ALIENS)
+- [BOI 2002 - Aliens](https://www.spoj.com/problems/ALIENS)
