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OpenStudy (anonymous):
Suppose a triangle has two sides of length 42 and 35, and that the angle between these two sides is 120. What is the length of the third side of the triangle?
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OpenStudy (anonymous):
is it 66.78?
OpenStudy (anonymous):
law of cosines 42^2 + 35^2 - 2(42)(35)cos(120)
OpenStudy (anonymous):
i got 595.30
OpenStudy (anonymous):
yes it is 66.78
OpenStudy (anonymous):
42^2 + 35^2 - 2(42)(35)cos(120) = 445.9 Now take the square root = 66.78
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