Gore, James Howard, 1856-1939 · New York, Longmans, Green, and co. · leaf 109
234. COR. PC = BP x PA; therefore (by 28), or PC=PC. EXERCISES. 1. If from a point without a circle twosecants be drawn, the product of one secantand its external segment is equal to the prod-uct of the other and its external segment. 2. If from a point without a circle anynumber of secants are… … §237.] RATIO AND PROPORTION. 97 PROPOSITION XX. PROBLEM. 235. To divide a given straight line into parts proportional toany number of given lines.
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-378-261.webp)
