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math

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A hiker travels N 33 degrees W for 15km, then turns 90 degrees and walks 12km in the direction S 57 degrees W At that time how far is the hiker from his starting point? What is his bearing from his starting point?

  • math - ,

    As usual, draw a diagram.

    the distance is easy, since we have a right triangle

    d^2 = 15^2 + 12^2 = 369
    d = 19.2

    The bearing is N (33+x) W where

    tan x = 12/15
    x = 37°

    bearing is N 70° W

    Alternatively, and with much more work,

    (0,0) + (15 cos 123°,15 sin 123°) = (-8.17,12.58)
    (-8.17,12.58) + (12 cos 213°, 12 sin213°) = (-8.17,12.58) + (-10.06,-6.54) = (-18.23,6.04)

    d^2 = 369
    tan x = -18.23/6.04 = -3.02
    x = 180-20 = 160° = N 70° W

  • math - oops - ,

    oops
    tan x = 6.04/-18.23

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