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math HELP!

posted by on .

nobody has answered yet and this is the only question I need :(

If angle A=30* and side b=4.0 km, how do I find side c?

I know that this is a 30-60-90 triangle but I don't know how to find the hypotenuse. please help!

  • math HELP! - ,

    Since angle B is 60 degrees, and A is less (30 degrees) the law of sines says that the length of side a is less than that of side b. The length of side c is given by the lasw of sines:
    c/sin 90 = c = b/sin60
    c = 4.0/0.866 = 4.619 km

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