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Finding area of quadrilateral from coordinates

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A(5,5), B(4,6), C(2,3), and D(1,2) are the vertices of a quadrilateral ABCD.
Find the area of ABCD.
Area =
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
sq. units