Find the measure of angle A Drawing to come.

2 years ago

|dw:1445838113591:dw|

2 years ago
OpenStudy (stylesprettygirl):

under 90

2 years ago
OpenStudy (stylesprettygirl):

over 35

2 years ago

I know I should use cosine. So don't I just do cosine90 x something?

2 years ago
OpenStudy (anonymous):

So with how that drawing looks, C must be 90. So now, let's try to find B. sin(B) = 5/21, sin(B) = 0.2381, $\sin^{-1} (0.2381) = 13.77 \deg$.

2 years ago
OpenStudy (anonymous):

Now that's your angle B. Add B and C together, then do 180 - (B+C). That will be your angle A.

2 years ago

76

2 years ago
OpenStudy (anonymous):

76.23, but yes. Try to be as accurate as possible with these problems.

2 years ago

Do you have time another one?

2 years ago
OpenStudy (anonymous):

Sure.

2 years ago