Abstract
This chapter describes focus, foci of central quadric, confocal central quadrics, and confocal paraboloids. The central quadrics are said to be confocal when they have the same three focal conies. Two paraboloids are said to be confocal if they have the same two focal parabolae. In general, three confocals pass through a point, two being elliptic paraboloids and the third a hyperbolic paraboloid.
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