hen half thesum of these four logarithms will be the logarithmiccosine of half the required angle.* * Demonstration. Let ABC, be a triangle of which the side AB, isgreater than AC: make AD=AC, join DC, bisect it in E, and join AE;draw EH parallel and equal to CB; join HB and produce it to meet… … 60 PLANE TRIGONOMETRY.EXAMPLES. 1. In the triangle ABC, are given AB=426, AC=365and BC=230j required the angle A. By Calculation. BC 230AC 365AB 426 Ar. Co.Ar. Co. 7.437717.37059 2)1021Half sum 510.5 log.log. 2.70800 Difference 280.5 2.44793 2)19.96423 Cos. * A 16° 20 9.98211 Angle A 32 40 Because…
Surveying · Plane trigonometry
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