Need help with bearings. (1 Viewer)

[whoisurdaddy]

Im having a bit of difficulty with this chapter because the books i have dont explain this chapter with detail. I can do the basic "bearings" questions but need someone to help explain harder questions that involve 3d trig and ones where you have to find the bearing of point a from point b or something like that(dont know what its asking for because I dont know the exact definition of a bearing lol). Thanks again in advance.

 

[-tal-]

Im having a bit of difficulty with this chapter because the books i have dont explain this chapter with detail. I can do the basic "bearings" questions but need someone to help explain harder questions that involve 3d trig and ones where you have to find the bearing of point a from point b or something like that(dont know what its asking for because I dont know the exact definition of a bearing lol). Thanks again in advance.

If you need help with something, post up a question, then it'll be easier to help.

A bearing is a measure of an object's direction from a certain point.

 

[Timothy.Siu]

just read the question and draw a good diagram if u can, it should help with these questions

 

[whoisurdaddy]

Question 7a)

http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2003exams/pdf_doc/mathemat_ext1_03.pdf

 

[tacogym27101990]

angle DBA = 30 (139 - 109)

the find expressions for AB and DB

and thern use the cos rule to find AD

 

[whoisurdaddy]

what is it asking for when its asking for the BEARING between point A and B

 

[Timothy.Siu]

we learnt that in yr 10...
its like
e.g.
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A-----------------------------B

bearing of B from A is 90 degrees

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A
..--
....--
.....--
......--
........--
..........B

Bearing of B from A is like 150ish

 

[whoisurdaddy]

we learnt that in yr 10...
its like
e.g.
|
|
|
|
|
|
|
|
|
|
A-----------------------------B

bearing of B from A is 90 degrees

|
|
|
|
|
|
|
|
|
|
A
..--
....--
.....--
......--
........--
..........B

Bearing of B from A is like 150ish

So bearing from A to B is 210 degrees?

 

[doink]

measure clockwise from positive y-axis, alternatively place a protractor on the y-axis with the curve facing the right and that is the way you measure True Bearings.