# Metric geometry : Generalization of the fundamental problem of tangents :

We have solved the fundamental problem we have called for tangents when presented with tangency conditions on a circle or a straight. Conceptually we can assume that both problems are the same, if we consider the straight as a circle of infinite radius. The statement therefore posed circumferences obtaining through two points were tangent to a straight or tangent to a circle.

# Metric geometry : Problem of Apollonius : rcc

Any of the problems of tangents that are included under the denomination of “Apollonius problems” can be reduced to one of the studied variants of the most basic of all: the fundamental problem of tangents (PFT).
In all these problems we will consider fundamental objective to reduce the problem to propose to one of these critical cases, by changing the constraints that define other concepts based on the orthogonality.

In this case we will study what we call “Case Apollonius RCC”, namely, For the problem of tangency at which the data are given by condition of tangency to a line (r) and two circles (cc).

# Metric geometry : Problema fundamental de tangencias : PPc [II]

The so-called fundamental problem of tangents may occur with respect tangency conditions of a circle, instead of a straight.

Conceptually we can assume that the above is a particular case of this, if we consider the straight as a circle of infinite radius.

In both cases therefore apply similar reasoning for resolution, based on the concepts learned power.

# Metric geometry : Problema fundamental de tangencias : PPr

Classically tangencies problems have been studied looking geometric constructions of each case study.

The concepts of power of a point on a circle can address the problems with a unifying approach, so that any tangency or incidences statement generally be reduced to a more generic fundamental problem tangents denominate (PFT).