SOLUTION: find the angle of a triangle with sides of 10,15,20 find angle of A: find angle of B: find angle of C:

Algebra ->  Trigonometry-basics -> SOLUTION: find the angle of a triangle with sides of 10,15,20 find angle of A: find angle of B: find angle of C:      Log On


   

Question 930849: find the angle of a triangle with sides of 10,15,20
find angle of A:
find angle of B:
find angle of C:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
find the angle of a triangle with sides of 10,15,20
find angle of A:
find angle of B:
find angle of C:
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Pick an angle and use the Cosine Law:
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20^2 = 10^2 + 15^2 - 2*10*15*cos(C)
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Then use the Law of Sines for the 2nd angle
sin(A)/a = sin(B)/b = sin(C)/c