Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 21
celes triangle is determined by any twoparts that determine one of these right triangles. Let the parts of an isosceles tri-angle CAB (Fig. 21), among whichthe altitude CD is to be included,be denoted as follows: a = one of the equal sides, c = the base, h = the altitude, A = one of the equal… … = /»». whence Also,whence 4 /i = V(a + ic)(a-ic). — = 8m.Ai and —=tan^4;a \e h = a sin A, and A = ictan^4. When c and h are known, the area can be found by theformula THE RIGHT TRIANGLE 33 EXERCISE X Solve the following isosceles triangles, finding the anglesto the nearest second: 1. Given a and A…
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