Question using the Sine Rule and Bearings

  • Thread starter Thread starter scotty_le_b
  • Start date Start date
  • Tags Tags
    Sine
AI Thread Summary
The discussion revolves around solving a geometry problem involving three towns represented as vertices of a scalene triangle, with specific bearings and distances provided. The user successfully identified angle DFG as 48 degrees using a z-angle but struggled with finding angle GFE, realizing that a missing angle in the diagram was the source of confusion. The sine rule is referenced as a key equation for solving the angles and distances in the triangle. The user seeks assistance for calculating the remaining angles and the bearing of E from D, as well as the distance between D and F. The conversation highlights the importance of accurate diagram representation in solving geometric problems.
scotty_le_b
Messages
19
Reaction score
0

Homework Statement


3 towns are located at D,F & E; the vertices of an scalene triangle. The bearing of F from D is 48 degrees. D to E=640m and E to F=430m. Point G is located at the end of a south line at F.

a)i)Find angle DFG
ii) Find angle GFE
iii) Find angle DFE

b) Calculate angle EDF
c)Calculate the bearing of E from D
d)What is the distance between D & F


Homework Equations


a/sinA=b/sinB=c/sinC


The Attempt at a Solution


a)i) I got 48 degrees because I used a z-angle
ii) This is the one I can't get so I can't do the rest. I've tried quite a few ways but can't seem to get it so there must be something I'm missing.
 
Physics news on Phys.org
I've got it now there was angle missing from the diagram :L
 
I picked up this problem from the Schaum's series book titled "College Mathematics" by Ayres/Schmidt. It is a solved problem in the book. But what surprised me was that the solution to this problem was given in one line without any explanation. I could, therefore, not understand how the given one-line solution was reached. The one-line solution in the book says: The equation is ##x \cos{\omega} +y \sin{\omega} - 5 = 0##, ##\omega## being the parameter. From my side, the only thing I could...
Back
Top