The density of a substance is usually measured in weight units per volume (for example, per cubic foot), not per area. For a square foot... it would depend how thick the slab of granite is. That may vary between different manufacturers.
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45 square meters = 484.375 square feet.
You can't convert that. You can convert feet to inches, or square feet to square inches.
75 square feet.
9ANS 2 - There are 10.78 square feet in one square metre
471 (square meters) = 5,069.80181 square feet.