Tangent Circles Theorem: Common Tangents & Concurrent Point.
School, SAT Prep, College The common tangents of three mutually
tangential circles A, B, and C taken in pairs are concurrent in
the point P. P is the incenter of triangle ABC (center of the
incircle). Dynamic Geometry: You can alter the figure above
dynamically in order to test and prove (or disproved)
conjectures and gain mathematical insight that is less readily
available with static drawings by hand. This page uses the
dynamic geometry software and requires Adobe Flash player 7 or
higher. TracenPoche is a project of Sesamath, an association of
French teachers of mathematics. Instruction to explore the
Animation. Click the red to start/stop animation Manipulate.
Drag points A and C to change the figure. Step by Step
construction. Press P and click the left mouse on any free area
to show the step-by-step bar and start the Hide the step-by-step
bar by using again the combination P + click left mouse.