Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 146
axis meets the base,is the centre of the polygon ABCDE(Def. 14.) ; hence the lines OA, OB, OC,&c. drawn to the vertices of the base,are equal. In the right angled triangles S AO,SBO,Uie bases and perpendiculars are equal :À-biice the hypothenuses are equal : andKmay be proved in the same way… … BOOK VU. 147 to its base EA multiplied by half the perpendicular SF, whichis the slant heiuiit of the pyramid : hence the area of all the tri-angles, or the convex surface of the pyramid, is equal to theperimeter of the hase multiplied by half the slant height. Coi\ The convex surface of the…
Trigonometry · Geometry
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