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September 18, 2014

September 18, 2014

Posted by **tori** on Thursday, February 16, 2012 at 10:54pm.

- geometry -
**yoyoma**, Thursday, February 16, 2012 at 11:33pmHello, there is no figure but I shall try my best to figure it out.

I think this is probably a triangle.

B

| C

| /

| /

A

AB= 8

AC=9

BC=3

A is 9 km SW of C and B is 3 km NW of C. I hope this helps.

- geometry -
**tori**, Thursday, February 16, 2012 at 11:48pmThank you a ton!!

- geometry -
**yoyoma**, Thursday, February 16, 2012 at 11:51pmNo problem!

- geometry -
**Steve**, Friday, February 17, 2012 at 10:47amTo find the actual bearings, find the angles A,B,C, using the law of cosines. For example,

BC^{2}= AB^{2}+ AC^{2}- 2*AB*AC*cosA

9 = 64 + 81 - 144cosA

cosA = 136/144

A = 19º

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