How do you find #angleB# if in triangle ABC, #a = 15#, #b = 20# , and #angle A=30^@#?
1 Answer
Dec 17, 2014
The answer is:
You have to use the law of sines, just as you thought. This law is:
We only need the first equation here, let's fill in the numbers.
We use cross-multiplication, then we find:
then by taking the inverse sine, we find
