Jim stands beside a wide river and wonders how wide it is. He spots a large rock on the bank directly across from him. He then walks upstream 65 strides and judges that the angle between him and the rock, which he can still see, is now at an angle of 30° downstream (Fig. 1–20). Jim measures his stride 30° ! to be about 0.8 m long. Estimate the width of the river. FIGURE 1-20 Problem 54. 65 Strides

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