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Geometry
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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 (amistre64):
law of cosines is useful
OpenStudy (amistre64):
\[c^2 = a^2+b^2 -2ab~\cos C\] |dw:1384357535018:dw|
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