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  1. Use the coordinates of the vertices to establish which two sides are parallel.
  2. Find the lengths of the two parallel sides (X and Y).
  3. Find the equation of a perpendicular to one of these lines at a point P.
  4. Find the point where this perpendicular line meets the other parallel line (Q).
  5. Find the distance PQ = H.
  6. Area = 1/2*(X + Y)*H
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11y ago

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