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Math Help - Vertices of a Parallelogram.

  1. #1
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    Vertices of a Parallelogram.

    I'm not sure if this belongs here but it is a question from my calculus homework:

    The points P(-2,1), Q(-6,4) and R(4,3) are three vertices of parallelogram PQRS.

    a) Find the coordinates of S.

    b) Find the measures of the interior angles of the parallelogram, to the nearest degree.

    c) Find the measures of the angles between the diagonals of the parallelogram, to the nearest degree.

    I'm not really sure how to start or what to do
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  2. #2
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    #1 - PQRS suggests that in a clockwise direction, starting at P, this is the order in which the vertices are encountered.

    #2a - Find R-Q and add that to P

    #2b - That looks like a job for a dot product.

    #2c - Find their vector representations and try another dot product.

    What have you tried? Show your work.
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