100000mm
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The answer depends on what is 10 km: the radius, diameter, perimeter. And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
The area of a rectangle is calculated by multiplying its length by its width. In this case, the area would be 8km x 5km = 40 square kilometers. The perimeter of a rectangle is found by adding the lengths of all four sides. For this rectangle, the perimeter would be 2(8km) + 2(5km) = 16km + 10km = 26 kilometers.