SOLUTION: In a triangle ABC, the length of side BC is 21.5, the length of side AB is 10.9, and the angle at C is 18.9 degrees. In degrees, and to 2 decimal places, what is the angle at A? Do
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Question 987372: In a triangle ABC, the length of side BC is 21.5, the length of side AB is 10.9, and the angle at C is 18.9 degrees. In degrees, and to 2 decimal places, what is the angle at A? Do not give any units in your answer. Your answer must be between 0 and 90.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Since you have two sides and the angle opposite one of those sides, you can use the Law of Sines. Side AB is side c and side BC is side a.
}\ =\ \frac{21.5}{\sin{A})
Cross-multiply:
)
}{10.9})
}{10.9}\right))
Make sure your calculator is set to degrees rather than radians.
John
My calculator said it, I believe it, that settles it
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