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The first six books of the elements of Euclid, in which coloured diagrams and symbols are used instead of letters for the greater ease of learners (1847)

Byrne, Oliver, Whittingham, Charles, 1795-1876, Chiswick Press · London : William Pickering · leaf 262

An illustration from The first six books of the elements of Euclid, in which coloured diagrams and symbols are used instead of letters for the greater ease of learners, 1847, leaf 262 — O yf«i/ a third proportionalto two given Jlraight lines At either extremity of the givenline ^—i^—» draw .---——making an angle ; take........^ = , and draw I : make .,.._... =: , and draw || —^ • (B. I. pr. 31.)lu - is the third proportionalto -■^—^^ and _ … For fince but (B. 6pr. 2); ■(conft.); (B. 5. pr. 7). Q^E. D. 230 BOOK VI. PROP. XII. PROB.

Euclid's Elements · Geometry

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