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A central atom attached to 3 other atoms, all lying on the same plane.
A pyramid is a generic term and can have any number (>3) of plane faces. A triangular pyramid has 4 faces, a rectangular one has 5, and so on. A pyramid whose base has n sides has n+1 faces.
Yes
Yes, the world "linear" and "line" have the same root.
No. Pyramids are three-dimensional, and hence cannot be drawn within a single plane.