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Hannah L.

asked • 07/05/16

pre calc BEARING problems, multiple questions, please answer ASAP, I am very confused

1)The bearing from A to B is 40°. Determine the bearing of A from B. 
2) If the beating from A to B is 120 degrees. Determine the bearing of A from B.
3) Describe in words what the bearing "N20 degrees W" means. You may wish to give directions or an alternative way to describe the location.
 
 
 

Michael J.

This looks like a vector problem.  You have the angles, which represents direction.  It might be helpful if coordinates are provide here.  If you could, can you recheck your question to see if you copied it correctly.
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07/05/16

Mark M.

Is this bearing "absolute?" That is measured from due North?
Is B east or west of A?
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07/05/16

Hannah L.

It does not give cordinates and it also doesn't say whether or not it's absolute
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07/05/16

Hannah L.

Which is why I'm A bit cnfused on how to solve it
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07/05/16

3 Answers By Expert Tutors

By:

Kenneth S.

Steven W. comments: In my experience, angles are conventionally measured from the +x axis counterclockwise (in other words, starting at due east and then swinging around counterclockwise. By this reckoning, an angle 20 degrees west of due north would be 90 degrees (the angle from east to north) plus the additional 20 degrees past north, heading towards west, so 90 + 20 = 110 degrees.
 
The above conventions are the one that are used in trigonometry, for the so-called circular functions...i.e. sine & cosine periodic functions of any real number (radian measure), with the domain ALL REALS.
 
But the BEARINGS used in navigation problems use0 to 360 degrees, measured CW beginning at North = 0 deg, etc.
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07/05/16

Kenneth S. answered • 07/05/16

Tutor
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Let's cut to the chase: I know this subject & how to teach YOU

Hannah L.

Thank very much! For my second qyestion would it just be 180+120=300 degrees and that is the bearing?
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07/05/16

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