Euclid:Proposition/X/74

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Proposition

In the words of Euclid:

If from a medial straight line there be subtracted a medial straight line commensurable with the whole in square only, and which contains with the whole a rational rectangle, the remainder is irrational. And let it be called a first apotome of a medial straight line.

(The Elements: Book $\text{X}$: Proposition $74$)


Sources