1. Lever
2. Fulcrum
fulcrum
effort
resistance i think.....
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The principal axis of a hyperbola is the straight line joining its two foci.
The boiler itself consists of two principal parts: the furnace, which provides heat, usually by burning fuel, and the boiler proper, in which water is converted to steam by the heat piped in from the furnace.
it is when you divide a line into two equal parts.
A bisection is a division or the process of division into two parts, especially two equal parts.
isometric drawing