Find the distance across the lake from A to C, to the nearest tenth of a yard, using the measurements shown in the figure. 140 yd 80° 160 yd B C
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The Law of Cosines states: c^2 = a^2 + b^2 - 2ab*cos(C), where c is the side opposite angle C. In this case, a = 140 yd, b = 160 yd, and angle C = 80°. So, c^2 = 140^2 + 160^2 - 2(140)(160)cos(80°). Show more…
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