Focus (geometry)
In geometry, the foci ( /ˈfoʊsaɪ/; singular focus) are a pair of special points with reference to which any of a variety of curves is constructed. For example, foci can be used in defining conic sections, the four types of which are the circle, ellipse, parabola, and hyperbola. In addition, foci are used to define the Cassini oval and the Cartesian oval.
Read more about Focus (geometry): Cartesian and Cassini Ovals, Generalization, Confocal Curves
Famous quotes containing the word focus:
“If we focus mostly on how we might have been partly or wholly to blame for what might have been less than a perfect, problem- free childhood, our guilt will overwhelm their pain. It becomes a story about us, not them. . . . When we listen, accept, and acknowledge, we feel regret instead, which is simply guilt without neurosis.”
—Jane Adams (20th century)