diff --git a/SLAM/GraphBasedSLAM/graph_based_slam.py b/SLAM/GraphBasedSLAM/graph_based_slam.py
index b40ad649..41b9d525 100644
--- a/SLAM/GraphBasedSLAM/graph_based_slam.py
+++ b/SLAM/GraphBasedSLAM/graph_based_slam.py
@@ -216,7 +216,7 @@ def observation(xTrue, xd, u, RFID):
 
         dx = RFID[i, 0] - xTrue[0, 0]
         dy = RFID[i, 1] - xTrue[1, 0]
-        d = math.sqrt(dx**2 + dy**2)
+        d = math.hypot(dx, dy)
         angle = pi_2_pi(math.atan2(dy, dx)) - xTrue[2, 0]
         phi = pi_2_pi(math.atan2(dy, dx))
         if d <= MAX_RANGE: