Extracurricular knowledge of cones and cylinders

Cone is a common shape of plumb hammer, which is often used to check the verticality of wall in construction industry.

Cones and cylinders belong to rotating bodies.

Cylinder is often used as a "roller" and is a common tool for moving heavy objects in transportation industry.

Cutting the cone with a plane parallel to the bottom surface of the cone and cutting the cone with the upper and lower bottom surfaces is called truncated cone.

Is this knowledge ok? If so, please adopt it in time. Thank you. I really can't think of anything else.