181 IHensiiratiort of Supetticeg, {Continued from page 174.) PROBLEM XI. To find the length of an arc A b, the circumference a d b a or the diameter d b beinggiven. A ^^ ^ B … 1. When the circumference is given, makethe following proportion—as 360 degrees is tothe number of degrees in the arc, so is the circumference to the length of the arc. 2. When the diameter is given, first find thecircumference by the last problem, and thenthe length of the arc as above. Example…
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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-87-64.webp)