Elements of geometry and trigonometry. Revised and adapted to the course of mathematical instruction in the United States (1856)
Legendre, A. M. (Adrien Marie), 1752-1833, Davies, Charles, 1798-1876 · New York : A.S. Barnes · leaf 69
eater than DE ths arc AKII is, greater than DME(p. 5). Cut off from the former, a part AXB^ equal toDME; draw the chord AB, and draw CF perpendicularto this chord, and CI perpendicular to AIL It is evidentthat CF is greater than CO (b. I., A. 8), and CO than CI(b. I., P. 15) ; therefore, CF is… … PEOPosrnoN ix. theokem. A straight line perpendicular to a radius, at its ixtijmity, istangent to the circumference. Let the line BD be perpendicular to the radius CA atits extremity A ; then will it be tangent to the circumfer-ence. BOOK III 65
Geometry · Trigonometry
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