Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 63
a cen-tre, with a radiuâ FG = DE, theother from E as a centre, witha radius EG=:DF; to the pointG, where these arcs intersecteach other, draw FG, EG ;DEGF will be the parallelogram required. For, the opposite sides are equal, by construction ; hence thefigure is a parallelogram (Book 1. Prop.… … PROBLEM XIIL To find (he centre of a gieen circle or arc. Take three points, A, B, C, anywhere in the circumference, or thearc ; draw AB, BC, or suj)pose t hemto be drawn ; bisect those two lines|jy the perpendiculars DE, FG :the point O, where these perpen-diculars meet, w ill be the centresf)ught…
Trigonometry · Geometry
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