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Find A in degrees

 

 Oct 3, 2020
 #1
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+1

Use the law of cosines.

 

72 = 92 + 132 - 2 * 9 * 13 * cos(A)      solve for angle A

 Oct 3, 2020
 #2
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0

corrections:

 

a = 13       b = 9      c = 7

 

132 = 92 + 72 - 2 * 9 * 7 * cos(A)

Guest Oct 3, 2020

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