1. Feb 10, 2015 #1

   LiHJ

   

   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
   
   
   

    

   LiHJ, Feb 10, 2015
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3. Feb 10, 2015 #2

   NascentOxygen

   

   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! :)

    

   NascentOxygen, Feb 10, 2015
4. Feb 10, 2015 #3

   LiHJ

   

   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

    

   LiHJ, Feb 10, 2015
5. Feb 10, 2015 #4

   LiHJ

   

   Thank you;)

    

   LiHJ, Feb 10, 2015

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