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Teokset Teokset 81 - 81 / 81 haulle The perpendiculars from the vertices of a triangle to the opposite sides meet in....
" The perpendiculars from the vertices of a triangle to the opposite sides meet in a point. Let the Js be AH, BP, and CK. Through A, B, C suppose B'C', A'C', A'B', drawn II to BC, AC, AB, respectively. Then AH is _L to B'C'. (Why ?) Now ABCB' and A CBC'... "
Vector Analysis: A Text-book for the Use of Students of Mathematics ... - Sivu 106
tekijä(t) Edwin Bidwell Wilson, Josiah Willard Gibbs - 1901 - 436 sivua
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Paractical Geometry Based on the Various Geometry Books by Godfrey and Siddons

...criticise the converses of the following facts: — (i) Congruent triangles have the same area. (ii) The perpendiculars from the vertices of a triangle to the opposite sides are three concurrent lines. 8. In the given figure OX, OY are two roads at right angles and ABCD is...
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