--- kf_03-13T15-48-25-648687.py
+++ kf_03-13T16-01-10-289415.py
@@ -1,4 +1,5 @@
 
+import math
 class Name:
     def __init__(self, name: str):
         self.name = str(name)
@@ -281,3 +282,9 @@
     if radius < 0.0:
         raise ValueError("radius must be non‑negative")
     return (4.0 / 3.0) * math.pi * radius ** 3
+def cylinder_volume_m3(radius_m: float, height_m: float) -> float:
+    radius = float(radius_m)
+    height = float(height_m)
+    if radius < 0.0 or height < 0.0:
+        raise ValueError("radius and height must be non‑negative")
+    return (math.pi * radius ** 2) * height