Area is two dimensions. You've given four, defining a hypervolume of 70x40x60x30 = 5,040,000 ft4 (hypercubic feet).
If you mean TWO areas, it's just a matter of simple multiplication, which is left as an exercise for the student:
70x40 = ___ ft2 (sq.ft., square feet)
60x30 = ___ ft2 (sq.ft., square feet)
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The land you are measuring is probably a rectangle, find the length of 2 sides (that are not directly across from each other) and then multiply them.
You can't have that many dimensions in an area calculation. Length and Width only.
3/8 square miles
molam
Honey, a kilometer is longer than a hectare. A hectare is a unit of area, measuring 10,000 square meters, while a kilometer is a unit of distance, measuring 1,000 meters. So, in this case, size does matter, and the kilometer takes the cake.