Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 120
is an external point, (3) represents its chord of contact;hence the polar and chord of contact of an external point are identical. 72. Theorem. — If the polar of P^ passes through P2, thenthe polar of Pg passes through P^.Let P, be (x^, y^), Pg {x^, y^).Then the polars of these points are ^^1 +… … i<^i.yi)
Geometry, Analytic
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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-185-101.webp)
