Definition:Euclid's Definitions - Book II

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Euclid's Definitions: Book $\text{II}$

These definitions appear at the start of Book $\text{II}$ of Euclid's The Elements.

  1. Any rectangular parallelogram is said to be contained by the two straight lines containing the right angle.
  2. And in any parallelogrammic area let any one whatever of the parallelograms about its diameter with the two complements be called a gnomon.