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Finding a triangles angles from its area + 2 sides

  1. Feb 9, 2009 #1
    1. The problem statement, all variables and given/known data

    A triangle had area of 21 cm² and two of its sides are 9 cm and 14cm long.
    Find the possible measures of the angle formed by these sides?


    2. Relevant equations

    Area= 1/2abSin(C)

    3. The attempt at a solution

    1/2 (9)(14)Sin C = 21 --> Sin C = (1/3)

    approx 19.5 or 160.5


    I'm just not sure if i did it right does this seem correct?
     
  2. jcsd
  3. Feb 9, 2009 #2
    Seems correct.
     
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