Advanced geometry for high schools : synthetic and analytical (1919)
McDougall, A. H. (Alexander Hiram), 1859-1946 · Toronto : Copp, Clark · leaf 120
• THE AREA OF A TRIANGLE 15 Note.—The points have been taken in circular order aboutthe A in the opposite direction to that in which the hands ofa clock rotate; if they are taken in the same direction as thehands rotate, the formula will give the same result only itwill appear to be negative; but,… … Fig. 12. (Unit = ,3„ inch.) Draw the diagram on squared paper. Draw theordinates AL, BM, CN. Through C draw RCS || Ox tomeet AL, BM produced at S, R. = BRSA 91 2 A ABCBRSA A BRC - A ACS.l(BR + AS)RS=i(7 + 6)X7 16 ELEMENTARY ANALYTICAL GEOMETRY 14ABRC = |BRXRC = |X7X2 =— • u 30AASC =|ASXSC = £X6X5 =…
Geometry · Geometry, Analytic
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