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 235
[237. assumed point is called the polar of the fixed point, whichis called the pole. ^^ _ 237. Trove that the polar of a given point, with respectto a circle, is a straight line on the same side of the centre asthe pole; that the straight line joining the centre and pole isperpendicular to the… … Fig. i. Fig. 2, Let C be the centre of the given circle, and P the given point. Through P draw the diameter EF, and take D so that Pand D may be harmonic conjugates to E and Fy and draw DPperpendicular to DE. Then DP is the polar of P. For, drawthrough P any transversal cutting the circle in. A, B…
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-348-238.webp)
