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

Q: Area of a trapezoid from vertices?

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