How many square millimeters are in one square inch?

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Multiple Choice

How many square millimeters are in one square inch?

Explanation:
Converting square inches to square millimeters comes from squaring the length units. Since 1 inch equals 25.4 millimeters, a square inch is (25.4 mm) × (25.4 mm) = 25.4^2 mm^2 = 645.16 square millimeters. Rounding to one decimal place gives 645.2 square millimeters. The other numbers are off by orders of magnitude or represent different units, so 645.2 mm^2 is the correct value.

Converting square inches to square millimeters comes from squaring the length units. Since 1 inch equals 25.4 millimeters, a square inch is (25.4 mm) × (25.4 mm) = 25.4^2 mm^2 = 645.16 square millimeters. Rounding to one decimal place gives 645.2 square millimeters. The other numbers are off by orders of magnitude or represent different units, so 645.2 mm^2 is the correct value.

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