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Vectors and similar triangles

  1. Feb 10, 2015 #1
    1. The problem statement, all variables and given/known data

    Dear Mentors and PF Helpers,

    Here's the question:


    2. Relevant equations

    3. The attempt at a solution

    Here's my solutions:

    Please let me know whether I'm right. Thank you

  2. jcsd
  3. Feb 10, 2015 #2


    User Avatar

    Staff: Mentor

    Hi LiHJ. How would you justify saying PQ is half the length of SR?

    Edit: the rest looks right, though you are a bit rough & ready with the geometry. PQRS shouldn't be designated using the Δ symbol! :)
  4. Feb 10, 2015 #3
    Because the question mention that Q is the midpoint of OR and PQ is parallel to SR. So triangle OPQ is similar to triangle OSR. Therefore P is a midpoint of OS
  5. Feb 10, 2015 #4
    Thank you;)
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