Posted by Louis on Sunday, September 23, 2007 at 11:07am.
I'm in gr 11 doing Trigonometry
14.2 = b
 
sin38 sin 67
a = 46
 
sin20 sin130
(10.7)^2 = (9.5)^2 + (12.4)^2  2(9.5)(12.4) cos <B
I just need someone to explain this to me because I just don't get it... thank you for any help

Math  bobpursley, Sunday, September 23, 2007 at 11:17am
You are dealing with the law of sines and cosines. I am not certain what you don't get. Is it the algebra?
1) b=14.2*sin67 / sin38 put these in the calculator and compute.
2) Same issue:
a= 46*sin20/sin130
3) Law of cosines:
cosB= ((10.7)^2  (9.5)^  (12.4)^2 )/[(9.5)(12.4)]
Then to find angle B, take the inverse cosine of that result.
If you have questions, ask.
Answer This Question
Related Questions
 tigonometry  expres the following as sums and differences of sines or cosines ...
 Trigonometry  I need help with I just can't seem to get anywhere. this is as ...
 algebra  Can someone please help me do this problem? That would be great! ...
 trig  The expression 4 sin x cos x is equivalent to which of the following? (...
 Trigonometry  I need to prove that the following is true. Thanks. csc^2(A/2)=...
 trigonometry HELP pleasE!  these must be written as a single trig expression, ...
 Trig  If angle A is 45 degrees and angle B is 60 degrees. Find sin(A)cos(B), ...
 TRIG!  Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...
 Trigonometry  Solve the equation for solutions in the interval 0<=theta<...
 Trigonometry  Prove the identity sin(x+y+z)+sin(x+yz)+sin(xy+z)+ sin(xyz...
More Related Questions