American text books of art education : Geometrical drawing (1873)
Smith, Walter, 1836-1886 · Boston : James R. Osgood & Co. · leaf 99
lels, are equal in area. Thus the parallelograms AB C D, A B CE, ABEF, beino-between the same parallels 1 2, 3 4, and on the same base AB are!equal in area. Proposition. — A triangle on the same base and between the samelparallels as a parallelogram is equal to half its area. Thus, the triangle ABC…
Geometrical drawing
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