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Math Help - Hi first time on height question

  1. #1
    neilo
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    Hi first time on height question

    I am trying to determine the height of some roofing trusses.I have only one measurement on each in metres and the angle of pitch is 12degrees. I am not sure whether the image will come through but I will try. long time since I was at school about 50 yrs. thanks Neilo
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by neilo View Post
    I am trying to determine the height of some roofing trusses.I have only one measurement on each in metres and the angle of pitch is 12degrees. I am not sure whether the image will come through but I will try. long time since I was at school about 50 yrs. thanks Neilo
    The basic relations you need to calculate the dimensions of a truss are
    shown in the attached diagram.

    For a 12 degree angle, we either use a calculator or a book of tables to
    get:

    tan(12 degrees) ~= 0.2126

    and

    sin(12 degrees) ~= 0.2079.

    So using the relations shown in the attachment and the dimensions from your
    diagram we have:

    case 1: h = 3.150 x tan(12 degrees) = 3.150 x 0.2126 = 0.6697m

    case 2: h = 2.700 x tan(12 degrees) = 2.700 x 0.2126 = 0.5740m

    case 3: h = 3.500 x sin(12 degrees) = 3.500 x 0.2079 = 0.7277m

    RonL
    Attached Thumbnails Attached Thumbnails Hi first time on height question-gash.jpg  
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