Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 84
have equal bases and equal altitudes, areequivalent. Place the base of one parallel-ogram on that of the other, so thatAB shall be the common base ofthe two parallelograms ABCDand ABEF. Now, since the par-allelograms have the same altitude, their upper bases, DC andFE, will fall on the same line… … 34 GEOMETRY Of Triangles and Parallelogram j
Geometry · Plane trigonometry
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