Added problems to circle-circle intersection article (#33)

Nalin Bhardwaj · tcNickolas · commit 5873d31f9718 · 2016-10-02T12:22:44.000-07:00
Added 2 practice problems to the circle-circle intersection article.
diff --git a/src/geometry/circle-circle-intersection.md b/src/geometry/circle-circle-intersection.md
@@ -31,4 +31,8 @@ The only degenerate case we need to consider separately is when the centers of t
 
 ## Practice Problems
 
-[RadarFinder](https://community.topcoder.com/stat?c=problem_statement&pm=7766)
+- [RadarFinder](https://community.topcoder.com/stat?c=problem_statement&pm=7766)
+
+- [Runaway to a shadow - Codeforces Round #357](http://codeforces.com/problemset/problem/681/E)
+
+- [ASC 1 Problem F "Get out!"](http://codeforces.com/gym/100199/problem/F)
