diff --git a/Engine.Physics2D/CollisionDetector.cs b/Engine.Physics2D/CollisionDetector.cs
index 648f9e9..8829d57 100644
--- a/Engine.Physics2D/CollisionDetector.cs
+++ b/Engine.Physics2D/CollisionDetector.cs
@@ -50,15 +50,15 @@ public class CollisionDetector : ICollisionDetector
         collisionInformation = default;
 
         Vector2D leftToRightCenter = left.CircleWorld.Center.FromTo(right.CircleWorld.Center);
-        float distanceCircleCenterSquared = leftToRightCenter.MagnitudeSquared;
-        float radiusSumSquared = left.CircleWorld.RadiusSquared + right.CircleWorld.RadiusSquared;
+        float distanceCircleCenter = leftToRightCenter.Magnitude;
+        float radiusSum = left.CircleWorld.Radius + right.CircleWorld.Radius;
 
-        float circleSurfaceDistanceSquared = distanceCircleCenterSquared - radiusSumSquared;
+        float circleSurfaceDistance = distanceCircleCenter - radiusSum;
 
-        bool collision = circleSurfaceDistanceSquared <= 0f;
+        bool collision = circleSurfaceDistance <= 0f;
 
         if (collision)
-            collisionInformation = new(left, right, leftToRightCenter.Normalized, Math.Sqrt(circleSurfaceDistanceSquared));
+            collisionInformation = new(left, right, leftToRightCenter.Normalized, -circleSurfaceDistance);
 
         return collision;
     }