Circles

Apollonian Gasket

Incenters and Excenters of a Cyclic Quadrilateral

Inverting a Chain of Circles

Steiner's Porism

Chain of Circles Tangent to Circle and Line

Arbelos Incircle

Archimedean Twins

The Bankoff Circle

Concyclic Points in an Arbelos

A Porism on Cyclic Quadrilaterals

Concurrency from Soddy Circles

Closure Property of Three Circles

Fixed Point Property of Concentric Circles (Same Side)

Fixed Point Property of Concentric Circles (Opposite Side)

Four Circles in a Circle

A Concurrence from Inversion

Steiner's Porism Concurrence 1

Steiner's Porism Concurrence 2

Steiner's Porism Concurrence 3

Tangent Circles in a Semicircle

Quadrisecting a Right Angle

Inversion of Intersection Points 1

Inversion of Intersection Points 2

Three Inscribed Circles

Six Inscribed Circles

Ten Inscribed Circles