Smart, Edward Howard · London : Macmillian and Co. · leaf 89
a system ofcoaxal circles. 17. If a variable circle touches two fixed circles, its radius bears aconstant ratio to the perpendicular distance from its centre on theradical axis of the two circles. CHAPTER VI. POLES AND POLARS. HARMONIC PROPERTIES OF THE CIRCLE. § 1. Prop. The locus of the…
Geometry, Projective
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