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 166
triangle CFG; and in figure II. the difference between the areaof the triangle CAE and the areas of the two triangles CBA, CDE,is equal to the difference between the area of the same triangleCAE, and the areas of the two triangles CFA, CGE; that is, thearea of the pentagon ABCDE is equal to the… … Let ABCDEF (Fig. I. and II.) be the given figure{in this case a hexagon), and A the angle in which thevertex of the required triangle shall be situated. For thesake of perspicuity, I shall enumerate the angles and sidesof the figure from A, and call the first angle A, the sec-ond B, the third C,…
Geometry, Plane
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