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anonymous

  • 4 years ago

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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  1. anonymous
    • 4 years ago
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    is it 66.78?

  2. anonymous
    • 4 years ago
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    law of cosines 42^2 + 35^2 - 2(42)(35)cos(120)

  3. anonymous
    • 4 years ago
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    i got 595.30

  4. anonymous
    • 4 years ago
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    yes it is 66.78

  5. anonymous
    • 4 years ago
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    42^2 + 35^2 - 2(42)(35)cos(120) = 445.9 Now take the square root = 66.78

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