Help with trig problem. (solving right triangle)

May 2010
2
0
I have just started Trig, since it was at the end of my geometry book. I am studying with a practice test, and I have come to a problem that wasn't in my book. They had similar problems, but not one like it, and since there are so many rules with geometry and trig I wasn't sure how to solve this. I would be grateful for some help please!

*Figure is a right triangle

Question: Given the Figure below (right triangle), find ,
a if sin B = 0.42, cos B = 0.91, tan B = 0.47 and c =60

Figure,



The triangle in the image is just like the one on my practice test, except it is flipped in the opposite direction if that make a difference, I don't know? A is facing the right on my practice test.

Thank you! :)
 

skeeter

MHF Helper
Jun 2008
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*Figure is a right triangle

Question: Given the Figure below (right triangle), find ,
a if sin B = 0.42, cos B = 0.91, tan B = 0.47 and c =60

Figure,

\(\displaystyle \cos{B} = \frac{a}{c}\)