Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 26
3) is the supplement of AE, and FG thesupplement of AF. In like manner, EOC is the supplementof A OF, and FOC the supplement of A OF. In any plane triangle, either angle is the supplement of thesum of the other two. 20. Instead of the arcs themselves, certain functions of thearcs, as explained… … 21. The sine of an arc is the distance of one extremity ofthe arc from the diameter through the other extremity. Thus, PM (Fig. 4) is the sine of AM, and PM is the sine of ^Z s t AM. 22. The cosine of an arc isthe sine of the complement ofthe arc, ^^ complement sine be-ing contracted into cosine.…
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