f the circle. 13. The centre of a chord of a circle being given, and the radius ofthe circle, determine the area within which the centre may lie. 14. In a given circle draw a chord of given length, not greaterthan the diameter, so that its centre may be on a given chord. 104 r;E(urETiiv.… … G D Let the chord AB, <>f the circle ABC, move parallel to itself from the centre 0 to the extremity of the diameter EF, to which it is always at right angles. TJiPu AB continHalhj (lecreases and ultimately vanishes. Join OA. Tlien since l ONA is a rt. ^ :. ON-+NA^=OA-. But OA- is always of…
Geometry · Geometry, Plane
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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-145-81.webp)
