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Math Help - Calculate side from angles and some other sides in triangle

  1. #1
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    Joined
    Jan 2010
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    Calculate side from angles and some other sides in triangle

    Hello,

    Please view attached image.

    I would like the forumla for calculating the length of B.

    What is known is the length of A (the entire length of that side), A2, D, D2 the angle of r and r2 (90 degrees).

    What is the formula for calculating the length of B?

    Thanks in advance!

    Regards,
    Niklas
    Attached Thumbnails Attached Thumbnails Calculate side from angles and some other sides in triangle-triangle.png  
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  2. #2
    Member
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    Dec 2008
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    Australia
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    similar triangles
    A2/A = D/B
    A2 x B = A x D
    B = (Ax D )/A2
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  3. #3
    Newbie
    Joined
    Jan 2010
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    Gee, so simple. Hope it's a good excuse that it was over 12 years ago I studied this...

    Thank's a lot!
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