Posted by **Tammy** on Wednesday, December 9, 2009 at 2:50pm.

My question is little a=6.17,; little b=5.25, little c=3.02 . Find A

- Trigonometry -
**Tammy**, Wednesday, December 9, 2009 at 2:53pm
It does have find all angles of a triangle ABC. little a=6.17,little b=5.25,little c=3.02 . Find CAP A

- Trigonometry -
**Reiny**, Wednesday, December 9, 2009 at 3:28pm
By the cosine law

6.17^2 = 3.02^2 + 5.25^2 - 2(3.02)(5.25)cosA

cosA = -.043279

angle A = 92.48 degrees

I would then use the Sine Law to find the second angle, and then the "sum of the angles in a triangle" theorem to find the third one.

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