## Coloured Quadrangles: A Guide to the Tenth Book of Euclid's ElementsThis is meant as a guide to give access to the tenth book for those who may have lost faith in the commentaries by Thomas Heath, but who shrink from the long wanderings through the Greek text. |

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a x and a y amber line segments amber quadrangles amber rectangle amber whole apotome application of area COLOURED QUADRANGLES commen commensurable in length commensurable in square commensurable magnitudes commensurable with h contain a red contain an amber converse decagon definitions diagram dlogos dynatai ek dyo Euclid's Elements Greek h inc inc inc incommensurable squares lemma Lesser line seg line segments commensurable mean proportional obscure plane surface proved radius ratio rational number rectangle contained red and commensurable red height red line segments red quadrangle red rectangle red square regular pentagon side and diagonal square number square root square which contain squares equal sum a x sum-of-two-reds sums and differences surable Take four numbers Theorem Thomas Heath Timaios triangle whence width word dynamis x.y is amber X'th book