Plane and solid analytic geometry; an elementary textbook . Fig. 20. Fig. 21. parallel to the X-F-plane are ellipses whose axes increaseas the section recedes from the origin. Sections made byplanes parallel to the other coordinate planes are parabo- Ch. V, § 33] QUADRIC SURFACES 255 las, which have their axes parallel to the Z-axis. Thissurface is shown in Fig. 20. It is called an elliptic parabo-. 2 2 loid. If b = #, -- -f- &- = 2 cz represents a paraboloid of a a revolution about the Z-axis.


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