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An inclined plane wrapped around a central cylinder to form a spiral is called a screw or a bolt.
This is very contextual and depends on what you need. The simplest form might be either cutting a block of wood into a wedge shape, or attaching a sheet of plywood to a block of wood on one end. A quick web search or Wikipedia search will give you more ideas.
Propellers of a boat or an aeroplane are literally a continuous inclined planes on an axle. Screws could also be described as an inclined plane on an axle. The work being done, however, is quite different: propellers push or pull a fluid - air or water. As with simple inclined planes, the incline angle is proportional - the greater the slope, generally speaking, the greater the force required to move it through the fluid. Meaning that the propeller is shaped in the form of a Wing which produces lift when it moves through the air. They are not considered a flat plane. However, some wings can be a flat plate design and produce lift.
no 2 points form a line, 3 points form a plane
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