This follows because the system of circles is equivalent to a set of Apollonian circles, forming a bipolar coordinate system.
2.
In the power diagram of a system of circles, all of the vertices of the diagram are located at radical centers of triples of circles.
3.
Under the control of the Greater London Council, London Transport introduced in 1981 a system of Circle line changed from serving a closed loop around the centre of London to a spiral also serving Hammersmith.
4.
:1 ) The system of circle and external point is symmetrical about the line joining the point to the centre of the circle, thus every feature has a mirror image by reflection in this line . 2 ) The system of two circles is symmetrical about the line joining their centres, so . . . talk ) 15 : 54, 17 October 2008 ( UTC)
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