The diameter of the bottom of the cylinder is 2cm, and the volume of the existing cylinder is several times that of the original cylinder after enlarging by 3:1

The diameter of the bottom of the cylinder is 2cm, and the volume of the existing cylinder is several times that of the original cylinder after enlarging by 3:1

If the diameter of the bottom surface of the cylinder is 2cm, then the radius is 1cm, and if it is expanded three times, it is 3cm, because the formula of the cylinder is as follows:
V=πr²h
Because π and H are constant, only the radius is changing, and it's a square multiple, so it's 3 & # 178; = 9