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Finding area of a triangle from coordinates

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The vertices of a triangle are A left parenthesis, 2, comma, 3, right parenthesis, B left parenthesis, 5, comma, 6, right parenthesis, and C left parenthesis, 6, comma, minus, 1, right parenthesis.
Find the area of triangle, A, B, C.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, start text, p, i, end text or 2, slash, 3, space, start text, p, i, end text
sq. units