The base is square, 410 feet each side
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The area of a parallelogram is the base times the height; the height must be measured perpendicular to the base. If you correctly measure the height perpendicular to the base and you get different measurements, then you are NOT dealing with a parallelogram.
No
The equator and the Greenwich meridian.
dimensions
the area of a trapezoid is the height times (base 1 + base 2)