Newton's Principia, sections I, II, III, with notes and illustrations. Also a collection of problems (1863)
Newton, Isaac, Sir, 1642-1727, Frost, Percival, 1817-1898 · Cambridge, London, Macmillan and Co · leaf 89
d AB, and the tangent AD, the three triangles RACB,RAB, and RAD, and the points A, B approach one another; then the ultimate form of the vanishing triangles isone of similitude, and the ultimate ratio one of equality. For, whilst the point B is approaching the point A, let AB,AD, AR be always… … B, A coincide the angle bAd will vanish, and therefore thethree triangles rAb, rAcb, rAd, will coincide, and aretherefore in that case similar and equal. Hence also, RAB,RACB, RAD, which are always similar and proportionalto these, will be ultimately similar and equal to one another. COK. And…
Mechanics · Celestial mechanics
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