A cylinder extends one circular base through a perpendicular height. Radius 3 m means diameter 6 m; the formula deliberately uses radius.
Keep the exact result as 45π m³
V = πr²h = π × 3² × 5 = 45π m³. The integer coefficient 45 is exact and stays attached to π.
The approximation is about 141.3716694115 m³
Evaluating 45π gives a finite display value. It is useful for scale but remains marked approximate and never replaces 45π in exact conversions.
Check radius and perpendicular height
If 3 m were the diameter, the radius would be 1.5 m and the exact volume 11.25π m³, one quarter of 45π. A slanted side also cannot replace the cylinder’s perpendicular height.