g the given circle, and their diam-eters forming a regular polygon. In the given circle let OA and OBbe two radii at right angles. Dividethe given circumference, commencingat B, into twice as many parts as semi-circles required, and draw diameters tothe points of division. Join BA. BAcuts the first… … diameters required. Prob. 75. To divide a circle into any number of parts tvhichshall be equal in area. Let the number of parts be four. Dividea diameter into twice as many equal partsas areas required, in this case eight, bypoints 1, 2, o, 4, etc. With 1 and 7 as cen-tres and radius 01 describe a…
Mechanical drawing
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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-192-110.webp)
![An illustration from Il terzo [-qvinto] libro ... (1551)](https://img.insideoutlibrary.com/img/200/ia-ilterzoqvintolib00serl-31-47.webp)
