# Homework Help: I am in need of help ( Idiot here)

1. Sep 27, 2011

### lionely

1. Three towns A,B and C lie on a straight road running east from A. B is 6km from A and C is 22km from A. Another town D lies to the North of this road and it lies 10km from both B and C. Calculate the distance of D from A and the bearing of D from A.

3.Well, I am terrible at drawing the diagrams here is my attempt.

I'm not sure where to put D, please be patient with me.

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Last edited: Sep 27, 2011
2. Sep 27, 2011

### Dick

Don't worry about the diagram. It's pretty clear from the description. But the distance between B and C is 16km, right? It's just a trig problem isn't it? Draw some triangles.

3. Sep 27, 2011

### lionely

The thing is, I'm not sure where to put D, for some reason I have a lot of problems doing bearings, it's weird I could do vectors and matrices without much problem...

4. Sep 27, 2011

### Dick

D must be midway between B and C, but some distance above on your diagram (North), yes? I'm not sure what your problem is.

5. Sep 27, 2011

### lionely

The problem is I'm an idiot haha, I'll try it again and get back to you.

6. Sep 27, 2011

### civilsurveyor

. -------------------------------------------------- D
------------------------------------- 10km--------l-----10km
l
A------------6km---------------B--------------16km---------------C

draw lines from B to D and from C to D and then a line from D to the line from B to C
now you have two right triangles, complete the square, or law of sines.
the 10km value is the hypotenuese.

Last edited: Sep 27, 2011
7. Sep 27, 2011

### lionely

Mr.Dick, I thank you for your time and help, I solved the question and I will continue to practice this and master bearings!

8. Sep 28, 2011

### saxen

Don't call yourself a idiot just becuase you are stuck. You go to school to learn right? You can't know everything up front!

9. Oct 1, 2011