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" TRIANGLES upon the same base, and between the same parallels, are equal to one another. "
Inventional Geometry: A Series of Problems, Intended to Familiarize the ... - Página 43
por William George Spencer - 1877 - 97 páginas
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Journal, Volumen13

1865
...propositions : — (1) The angles of a triangle are together equal to two right angles. (2) Parallelograms upon the same base, and between the same parallels, are equal to one another. (3) The squares on the sides containing the right angle of a right-angled triangle are equal to the...
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