The elements of navigation : containing the theory and practice, with all the necessary tables, to which is added, a treatise of marine fortification ... (1754)
Robertson, J. (John), 1712-1776, Adams, Charles Francis, 1807-1886, former owner. BRL, Adams, John, 1735-1826, former owner. BRL, Boston Public Library) John Adams Library BRL · London : Printed for J. Nourse ... · leaf 95
lefs than the cir-cumferibed polygons: Therefore half their fums may be taken for thecircumference of the circle, when the number of thofe fides is very o-reat. 262. Hence, The circumferences of circles are in proportion to oneanother, as the radii of thofe circles, or as their diameters. • For the… … 263. THEOREM XXXI. In a circle (afb), if lines (ba, da, fa) be drawnfrom the extremities of two equal arcs (bd, df) to meetin that point (A) of the circumference determined by oneof them (ba) pajjing thro the centre; then Jhall themiddle line (ad) be a mean proportional between the fum(ab-j-af) of…
Navigation · Nautical astronomy · Fortification
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-32-41.webp)
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