Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 90
thirdand fourth corollaries of Prop. XI. PROPOSITION XXIV. THEOREM. Two triangles having an angle in each equal, are to each otheras the rectangles of the sides which contain the equal angles. In the two triangles ABC, ADE, let the angle A be equal tothe angle A ; then will the triangle ABC : ADE :… … In like manner, ABC ABE : : AC : AE. Multiply together the corresponding terms of these proportions,omitting tjie common term ABE ; we have ABC : ADE : AB.AC : AD.AE. BOOK IV 91
Trigonometry · Geometry
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