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If the coordinates are (3,11) (9,11) (9,6) (3,6) just look at the changes in the first number (the x coordinate) and the changes in the second number (the y coordinate). In this case, the x coordinate changes by 6 and the y coordinate changes by 5. You multiply the two and you have the area, 30.

Note: doesn't work if the first number and the second number change in every coordinate

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15y ago

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