# Concentric Circles

### Some articles on circles, circle, concentric:

Steiner Chain - Annular Case and Feasibility Criterion
6 n = 9 n = 12 n = 20 The simplest type of Steiner chain is a closed chain of n circles of equal size surrounding an inscribed circle of radius r the chain of circles is itself ... The inscribed and circumscribed given circles are concentric, and the Steiner-chain circles lie in the annulus between them ... By symmetry, the angle 2θ between the centers of the Steiner-chain circles is 360°/n ...
Steiner Chain - Properties Under Inversion
... of Steiner chains In an annular Steiner chain, the angle subtended by a single circle is 2θ (gold lines), which is also the angle subtended by adjacent points of tangency Two circles (pink and cyan ... The gold circles intersect the two given circles at right angles, i.e ... orthogonally The circles passing through the mutual tangent points of the Steiner-chain circles are orthogonal to the two given circles and intersect one another at multiples ...

### Famous quotes containing the word circles:

And why do you cry, my dear, why do you cry?
It is all in the whirling circles of time.
If millions are born millions must die,
Robinson Jeffers (1887–1962)