Hiker walks in the direction 153 and stops when she is 20km south of her srrting point. How far did she walk
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Assume that she walks 153° due Southwest.
Take the difference between 180° and 153°, and we have 27°. That means she walks 27° from South. Draw the triangle, and we have the right triangle, having 20 km as the side adjacent to the angle. Use the cosine function to get...
cos(27°) = 20/x
x = 20/cos(27°)
x ≈ 22.45 km
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