An elementary treatise on geometry : simplified for beginners not versed in algebra (1833)
Grund, Francis J. (Francis Joseph), 1805-1863 · Boston : Carter, Hendee & Co. · leaf 165
. And in figure II. the difference between the areas of the twotriangles ABD, BCD, that is, the quadrilateral ABCD, is equalto the difference between the triangles ABD, EBD, which is thetriangle ABE. Problem XXIV. To transform a given pentagon intoa triangle, whose vertex shall he in a given angle… … 1. From C draw the diagonals CA, CE. 2. From B draw BF parallel to CA, and from D drawDG parallel to CE. 3. From F and G, where these parallels cut AE or itsfurther extension, draw the lines CF, CG; CFG is thetriangle required. Demon. In both figures, we have the area of the triangleCBA equal to…
Geometry, Plane
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