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A triangle has sides 5 and 8 enclosing an angle of 60 degrees. What is the third side?
A6 units
B7 units
C9 units
D12 units
Answer & Solution
Correct answer: B. 7 units
c squared = 25 + 64 - 2(5)(8)(1/2) = 49, so c = 7.
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