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 274
BOOK VI. PROP. XIX. THEOR. 241 IM IL A R trian- gles ( A and ^^^^^k ) are to oneanother in the duplicate ratioof their homologous Jides. … Let ^^ and A be equal angles, and and homologous fides of the fimilar triangles i^HHft and MKKKL and ^^^^^^ ^nd on -.-.-.—— the greaterof thefe lines take --■—■ a third proportional, fo that * «■■■■■■■■■ \ draw (B. 6. pr. 4) ; but (B. 5. pr. 16, alt.), ■■■>■■■ MiSa (conll:.),— confe- 11 242 BOOK…
Euclid's Elements · Geometry
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