Proposition XLI. Theorem.
|(190)||If a parallelogram (B D) and a triangle (B E C) have the same base and be between the same parallels, the parallelogram is double of the triangle.|
(193) If a parallelogram and triangle have equal bases, and the altitude of the triangle be double the altitude of the parallelogram, they will be equal.
Book I: Euclid, Book I (ed. Dionysius Lardner, 11th Edition, 1855)
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