The complete measurer; or, The whole art of measuring .. (1789)
Hawney, William · London : Rivington · leaf 106
477 2.598076 78 9 Heptagon Octagon Enneagon 3-633912 4.8284276.181824 lO II 12 DecagonEndecagon Dodecagon 7.69^2099.36564^ 11.196152 Multiply the Square of the Side by the Tabui^VrNumber, and the Produdlis the Area of the Polygon* • How to find theje tabular Numbers,- Thefe Numbers arefound by… … A I> S Divide 90 Menfuraiion of Superficies. PaVt H, Divide 360 by 12 (the Number of Sides), and theQuotient is 30 Degrees for the Angle ACB ; theHalf of which is 15, the Angle DCB, whofe Com-plement to 90 Degrees is 75 Degrees, the AngleCBD : Then fay : As s, DCB 15 Degrees is Co-ar. 0.587004…
Measurement · Geometry
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