Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 75
i t* - Ks — a)(s — c)* ac and by Formula [29], p. 81, cos \ B = yjs ^ ~ ^ • By substituting these values of sin \ B and cos \ B in theabove equation, we have 2_ac sin B = — Vs (s — a)(s — ft) (s — c).etc By putting this value of sin i? in [33], we have F = Vs (s — a) (s — b) (s — c). [35] Case IV… … smB = 2R By putting this value of sin Bin [33], we have * = £• [36] Fig. 66 THE OBLIQUE TRIANGLE 87 If r denotes the radius of the inscribed circle, divide thetriangle into three triangles by lines from the centre of thiscircle to the vertices; then the altitude of each of the threetriangles is…
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