PLANE CURVES A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site Soddy circle Inner and outer Soddy circles (red) Picture credit: Wikipedia A solution to the three-circle form of the Apollonius problem in which each of the given circles is tangent to (just touches) the other two.1 There are two Soddy circles: the outer Soddy circle, which surrounds the three given circles, and the inner Soddy circle, which is interior to them. The inner Soddy circle is the solution to the four coins problem. Reference Soddy, F. "The Kiss Precise." Nature, 137: 1021, 1936. Related category    • PLANE CURVES Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP