Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 101
rom the triangles BAD and DAC, we haveBD : AD :: AD -. DC. Cor. If from a point A, in thecircumference of a circle, AD bedrawn perpendicular to any diam-eter as BC, and the chords ABA C be also drawn, then the an-gle BA C will be a right angle(Bk. II. Th. x): and by thetheorem we shall have, 1st… … COOK IV 11. Proportions o f Triangles ?B THEOREM XIX. Similar triangles are to each other as the squares described ontheir homologous sides Let ABC and DEF betwo siinilai triangles, andA L and DN t\ie squares de-scribed on the homologous TOsides AB, DE: then willthe triangle ABC : DEF : : AL : DN.…
Geometry · Plane trigonometry
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