Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 86
BOOK IV. 85 Of Triangles and Parallelograms since these parallelograms have a common base and equalaltitudes, they will be equivalent (Th. i). But the triangle ABC is half the parallelogram BE (Bk. LTh. xxiii); and A BD is half the equal parallelogram BF.hence, the triangle ABC Is equivalent :o the… … THEOREM 111. Lj a triangle and a -parallelogram have equal basts and equalaltitudes, the triangle will be half the parallelogram. Place the base of the triangle on thebase of the parallelogram, so that ABshall be the common base of the tri-angle and parallelogram : then will thetriangle ABE be half…
Geometry · Plane trigonometry
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