Thursday

September 3, 2015
Posted by **sandra** on Tuesday, January 10, 2012 at 11:52am.

- math -
**Steve**, Tuesday, January 10, 2012 at 12:29pmAs 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 -
**Steve**, Tuesday, January 10, 2012 at 12:29pmoops

tan x = 6.04/-18.23