# Spherical trigonometry basic

• Dec 5th 2010, 11:01 PM
SamanthaMathGirl
Spherical trigonometry basic
I think this is a fairly easy one. So if someone would give me any hint to the solution to this problem, then I can carry on.

Problem 1:

The bearing of B from A is 70 degrees North of East; the bearing of C from B is 60 degrees South of East and the bearing of A from C is 20 degrees South of West. If AB is 10 meters, find the length of BC.

Thank you very much guys !!
• Dec 8th 2010, 11:27 AM
earboth
Quote:

Originally Posted by SamanthaMathGirl
I think this is a fairly easy one. So if someone would give me any hint to the solution to this problem, then I can carry on.

Problem 1:

The bearing of B from A is 70 degrees North of East; the bearing of C from B is 60 degrees South of East and the bearing of A from C is 20 degrees South of West. If AB is 10 meters, find the length of BC.

Thank you very much guys !!

1. This problem has nothing to do with spherical trig.

2. Did you make a sketch?

3. Use the Sine rule to start the calculations.