diff --git a/src/numerical/monte_carlo.py b/src/numerical/monte_carlo.py
index 070ae2f..e62146e 100644
--- a/src/numerical/monte_carlo.py
+++ b/src/numerical/monte_carlo.py
@@ -9,7 +9,7 @@ def monte_carlo_pi(num_samples: int) -> float:
         x = random.uniform(-1, 1)
         y = random.uniform(-1, 1)
 
-        if x**2 + y**2 <= 1:
+        if x * x + y * y <= 1:
             inside_circle += 1
 
     return 4 * inside_circle / num_samples