7. The volume of ice is given by the product of the semicircular surface area and the thickness. The are of the semicircle is A= πr2/2, where ris the radius. Therefore, the volume is 22Vrzπ=wherezis the ice thickness. Since there are 103m in 1 km and 102cm in 1 m, we have ()32510 m
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Orders of magnitude, semicircular surface area