diff --git a/demo.py b/demo.py
index 4592eec..674fce3 100644
--- a/demo.py
+++ b/demo.py
@@ -2,4 +2,4 @@
 
 def circle_area(radius):
     """Returns the area of the circle of given radius"""
-    pass  # YOUR CODE HERE
+    return math.pi * (radius ** 2)