The diameter of a cylindrical steel bottom is 8cm, and the length is 90cm. Make it into a cylindrical machine with the diameter of 20cm What's the height of the piece

The diameter of a cylindrical steel bottom is 8cm, and the length is 90cm. Make it into a cylindrical machine with the diameter of 20cm What's the height of the piece

Cone volume = cylinder volume = 3.14 * 4 * 4 * 90 = 4521.6 cubic centimeter
Cone volume = 1 / 3 * 3.14 * 10 * 10 * H = 4521.6
H = 4521.6 * 3 / 314 = 43.2 cm
The height is 43.2 cm