The surface of the earth has an area of approx 510.1 million sq km
→ 510.1 million km² ÷ 4.9 million km² ≈ 104.1 times.
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For square units, the prefix is applied to the base unit - that is, before squaring it, not after. Thus, a square kilometer (km2) = 1000 m times 1000 m, which is equal to a million square meters.
it is 630.83522583901085036588443098663 times around the earth
We only need length times width to calculate area. Half a foot by 10 feet = 5 square feet. You'd need 60 of them to cover 300 square feet.
It depends on the thickness of slab. A yard of cement contains 9 cubic feet. Thus, it would cover 9 square feet if the slab was 1 foot thick. For a 4 inch thick slab, it would cover 3 times as much area, or 27 square feet.
(2,000 years) times (1,000 years) = 2 million square yearsThat quantity has no physical significance.