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Math Help - Right Angles

  1. #1
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    Right Angles

    Given Right Triangle has side b=5, B=15 degrees. I calculated: sin 15 = 5/H which results in H = 7.69. But H is actually 19.73 What is wrong with my equation and/or calculation.
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  2. #2
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    sin15 degrees = 0.2588. Check the mode of angle in you calculator.
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  3. #3
    Senior Member Educated's Avatar
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    Yes, sa-ri-ga-ma is right. In these types of situations where it says that the angle is 15 degrees, then you must out your calculator in degrees mode.

    The answer you got, H = 7.69, was when you used sin(angle) in radians.

    If you don't know how to get degrees on your calculator, then you can convert degrees into radians by:
    angle * \pi{ } / 180
    and that will convert your angle from degrees to radians.
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