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Need some help (cumulative math problem)

  1. Jan 22, 2006 #1
    i need to finish this before i move on tomorrow. any help? thanks

    Points M and N are the midpoints of opposite sides of paralellogram ABCD. Prove that:
    a) R and S trisect diagonal BD
    b) R is a points of trisection of AN and S is a point of trisection of MC.

    [​IMG]
     
  2. jcsd
  3. Jan 23, 2006 #2
    Try examining the proportions between the triangles BRN, BSC, DMS,DAR
     
  4. Jan 23, 2006 #3
    Prove AN||CM and AM = CN. Now go with triangle ABN and CMD. Then compare triangles as Pseudo said like BRN and ARD and then BRN and DSM
     
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