St. Mark's rest : the history of Venice written for the help of the few travellers who still care for her monuments (1885)
Ruskin, John, 1819-1900 · New York : Lovell · leaf 418
d e parallel to b c. Now as a <i is parallel to a b— A c : a c :: hc : de; but A c is equal to b c- APPENDIX. .. a c = d e. 89 Now because the triangles a c y, b d v, are similar— a c : 6 c :; a V : 6 V ;and because the triangles d e t, b c t are similar— d e : h c :: d T : b T. But a e is equal… … 90 THE ELEMENTS OF PERSPECTIVE. n. THE THTRD COROLLARY, PROBLEM HI. In Fig. 13, since a r is by construction parallel to a b in Fig.12., and t v is by construction in Problem ILL also parallel to A B— . *. a R is parallel to t v,. *. a 6 R and t 6 v are alternate triangles,.•. a R ; T V :: a 6 : 6…
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