Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 195
c = sin \ (a — ft) cos £ C 2 v cos i- (<x 4- ft) J tanK-l-B)^5inf^7^cot^.2 v y sin i (a 4- ft) cos i(4 — B) x , sini(.4 — £),tan 1 (a — ft) = -—2 ; ( tan i c. ^v y sm| (.4 4- B) 2 M „ itR2E51- F=-180- 52. tan2i E = tan 15 tan \(s — a) tan 1 (s — ft) tan \ (s — c). 50. ^ 206 FORMULAS The… … Fig. 123 The construction consists of two parts. 1. Lay off from the vertex V a units distance on each edge. 2. Pass through the three extremities of these distancesthree planes perpendicular to one of the edges, as VA. ISTowthese three parallel planes will cut out three similar righttriangles. The…
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