Exercises on Euclid and in modern geometry for the use of schools, private students, and junior university students (1881)
McDowell, James L · Cambridge, Deighton, Bell, and Co. · leaf 233
different kinds, the radical axis ofthe two circles will be that internal axis of similitude whichjmsses through the external centre of similitude of the firstpair of the three circles. Let the two circles ABC, DEF touch the other three at thepoints A, B, C and D, E, F respectively, the contacts… … Now, since the circles ABC and DEF touch BYE and CZF,their radical axis passes through L (232). 236.] AND IN MODERN GEOMETRY, 205 Similarly, it passes through M and N. Therefore LMN is the radical axis of the two circles ABCand DEF. The other cases of the theorem can be proved in the samemanner. Q.…
Geometry
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-359-250.webp)
