circle of Apollonius (suomeksi)

Määritelmät:

(label, en, geometry) The figure (a generalised circle) definable as the locus of points ''P'' such that, for given points ''A'', ''B'' and ''C'', $\frac{, AP, }{, BP, } = \frac{, AC, }{, BC, }$ .
(label, en, geometry) Any of eight circles (including degenerate cases) that, for a given set of three circles, solve the (w, problem of Apollonius) (i.e., intersect each circle tangentially).