392ft3
If there are three dimensions, the figure is three dimensional (a box). I has volume, which is measured in cubic feet, ft3.
V = 7x7x8 = 49x8 = 392 cubic feet.
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5.2 sq metres, approx.
An 8ft x 8ft rectangle is actually a square. The area is l x w = 8ft x 8ft = 64ft2.
Not so sure about squar metter (as the question appeared) but it is approx 9.7 sq metres.
8ft*5ft = 40 sqft = 3.716 sq metres (to 3 dp).
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