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Math Help - missing angle

  1. #1
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    missing angle

    Find the missing angle.
    Triangle has 2 angles. One 45 degrees and the other of 106 degrees. My choices are
    A) 84degrees B) 86 degrees C) 29 D) 82 degrees
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  2. #2
    Senior Member topher0805's Avatar
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    It a geometrical rule that the three angles in any triangle will have a sum of 180 degrees. In equation form:

    \theta_1+\theta_2+\theta_3=180<br />

    Since you already know two of the angles, finding the third is simply algebra.
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