Question

Two hikers take two different straight-line paths from the campground. Hiker A walks 4 km and hiker B walks 5 km. If they angle between their paths is 40°, how far apart are the hikers?
c^2 = a^2 + b^2 - 2 a c cos C
c^2 = 16 + 25 - 40 cos 40

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