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area circle = π × radius² = π × (400 miles)² = 160000π sq mi ≈ 502655 sq mi
A 1 mile radius circle covers approximately 3.14 square miles, which is equivalent to 2,008 acres.
The question is meaningless. A radius is not a measurement unit. A radius can be thousands of miles or thousandths of a mile.
A mile is the length of a line, square miles are the measure of area, typically of a square or rectangle
A square mile is composed of 1 mile by 1 mile, so there is 1 mile in a square mile.