An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth (1888)
Gwilt, Joseph, 1784-1863, Papworth, Wyatt Angelicus Van Sandau, 1822-1894 · London Longmans, Green · leaf 334
Chap. 1. CONIC SECTIONS. 313 … But by the similar triangles TAD, TPxM, TCE, and TBF, the sides AT, PT, CT,and BT are proportional to the tour perpendiculars AD, PM, CE, BF. Therefore AD: PM::CE : BF. 1092. Theorem IX. The two radius vectors meeting the curve in the same point will mnkiequal angles with a tangent passing through…
Architecture · Architects
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