A rectangular parking lot has a perimeter of 820 ft. The area of the parking lot measures 42 comma 000 ft squared What is a dimension of the parking lot?

The perimeter gives 2(length + width) = 820, so the two dimensions add to 410 ft. They also multiply to 42,000 square feet; 210 × 200 = 42,000, and 210 + 200 = 410. Therefore, a dimension is 210 ft, choice D.

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