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Posted by on Thursday, April 28, 2011 at 9:42pm.

law of cosines

m<c=60, a=12,b=15 triangle

  • law of cosines - , Thursday, April 28, 2011 at 9:46pm

    The law of cosines is:

    a^2 = b^2 + c^2 - 2cosA
    b^2 = a^2 + c^2 - 2cosB
    c^2 = a^2 + b^2 - 2cosC

    the lower case letters are sides, the capital letters are for angles. For this problem, you would do

    c^2 = 12^2 + 15^2 - 2cos60

    That gives you side c. After that, you should be able to use the law of sines to find the other two angles of the triangle.

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