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Homework Help: Projections checkß

  1. Sep 7, 2011 #1
    1. The problem statement, all variables and given/known data

    Are given points A (a ', a) and point B (b', b) and horizontal projection of point Q (q)
    REQUIRED
    real size of the beam of sphere with center Q and A and B are points on its surface.


    2. Relevant equations



    3. The attempt at a solution
    This is a problem i solved at a test at school!
    But im 90% that is corect ?I need a check for this ?Pls
     

    Attached Files:

  2. jcsd
  3. Sep 8, 2011 #2
    Some expalanation...

    1.after I find the point q 'I do so to find the radius of the sphere
    J 2.build the plan J (orange) thats si parallel with Ox in Horizontal ... plan J cross from b and expects the line ab at point 1
    3.finde its projection on V. .. point 1 '.
    4.build a new shaft X1 O1 (red line) perpendicular to the plain J
    5.build design points a'b 'a' q '...
    6.result is an interconnect (a line with all the points)(green line)
    crate a new axle O2 x2 ...thats parallel with the greend line
    8.build the projections of points ... and the triangle formed is in its rala size ... 2 equal rib demonstrating that the points A and B on the surface
    9.from the Q build the circle flowing from b and a. ..
    10. QA QB are the radius of the circle ... the sphere


    so what do u think ?? is this correct?
     
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