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Math Help - Three Dimensional Problems , advice needed!

  1. #1
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    Three Dimensional Problems , advice needed!

    Hi everyone, I find it quite difficult to solve three dimensional problems in trigonometry.

    I would be delighted if any of you could give me advice on solving such problems, providing me with the steps taken to solve it.You can also tell me what should I consider first , and find out what , eg the right angle triangle and so on.


    Thanks in advance!
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by ose90 View Post
    Hi everyone, I find it quite difficult to solve three dimensional problems in trigonometry.

    I would be delighted if any of you could give me advice on solving such problems, providing me with the steps taken to solve it.You can also tell me what should I consider first , and find out what , eg the right angle triangle and so on.


    Thanks in advance!
    Would you give us a particular example, so we would be able to help you out properly?

    --Chris
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  3. #3
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    Alright, this is my example question.

    Each side of a uniform tetrahedron ABCD has a length of 4a. The point P lies on BC such that BP = 3a . Find the cosine of angle ADP ( solved).
    Show that the perpendicular distance of vertex A from the plane BCD is (4/3)(a)(sqrt 6), and hence show the angle that the line AP makes with the plane BCD is inverse sin (sqrt (32/39)).
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