80 square meters.
The formula for the volume of a rectangular prism is (length * width * height), or (area * height), since area = (length * width).
area * height = volume
area * 8 = 640
Divide by 8 on both sides.
area = 640 / 8
area = 80
So, the area of the base of the prism is 80 square meters.
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