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The angle of intersection between a curve and a plane

  1. May 11, 2013 #1
    1. The problem statement, all variables and given/known data

    r(t)=(t^2+t)i+(t^3-4)j+(3-t)k

    r(t) hits the xy plane at the point (12,23,0). Find the angle on intersection of r(t) with the xy plane at that point.

    Angle=

    2. Relevant equations

    cosθ=(AxB)/lAllBl

    3. The attempt at a solution

    I find the answer was 0.0017 degree, but the answer was absolutely wrong....

    please help me :)
     
  2. jcsd
  3. May 11, 2013 #2

    HallsofIvy

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    Staff Emeritus
    Science Advisor

    You haven't actually shown what you did. What did you use for A and B?
     
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