The measure of angle A to the nearest tenth of a degree is:
1) 18.5
2) 19.5
3) 20.5
(picture)

Question

The measure of angle A to the nearest tenth of a degree is: 
1) 18.5
2) 19.5
3) 20.5 
(picture)

anonymous · Answer

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anonymous · Answer

Alright, are you familiar with sine, cosine, tangent?

anonymous · Answer

Somewhat. I just don't know how to use the two sides to get the angle as well as I do finding a side from the angle.

anonymous · Answer

So write an equation involving sin, cos, tan. Can you do that?

anonymous · Answer

I don't know how to write the equation to find an angle.

anonymous · Answer

Alright. So you have sin(A)=3/9=1/3. Use arcsin, or the inverse sine function, to get the value of A.

anonymous · Answer

I guess that's where I haven't learned that. My sister was only showing me the part where I can use the sin of an angle to find a side usually. Could you tell me what I do from what you were saying? Do I multiply or divide or something?