Posted by MW on Monday, April 13, 2009 at 9:16pm.
In triangle ABC, b=14, c=15, and cos a= 3/5.
Find
a)side a
b) Sin B
Help please?

Pre Calc  Reiny, Monday, April 13, 2009 at 9:23pm
In this notation, small letters are usually used to represent sides, and capital letters to indicate the angles at the vertex,
so yours : b=14, c=15, cos A = 3/5
direct application of the cosine law
a^2 = 14^2 + 15^2  2(14)(15)cos A
= ....
once you have a
use the Sine Law to find angle B

Pre Calc  MW, Monday, April 13, 2009 at 9:53pm
ok. I have side A.
How do you find angle B?

Pre Calc  Damon, Monday, April 13, 2009 at 10:16pm
sin B/b = sin A/a
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