Millimeters
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To find the area of a book cover in metric units, the most appropriate unit to use would be centimeters. The formula for finding the area of a book cover would be: length x width.
Square metres
The square meter is the metric (International) unit of area. Google gives 1 acre as 4046.86 sq. meters.
The metric unit for distance/length is the metre, but what kind of formula are you asking for?
You can't just convert any unit to any other unit. The units must be of a compatible type. Thus, you can convert a unit of length to another unit of length, a unit of area to another unit of area, or a unit of volume to another unit of volume.You can't just convert any unit to any other unit. The units must be of a compatible type. Thus, you can convert a unit of length to another unit of length, a unit of area to another unit of area, or a unit of volume to another unit of volume.You can't just convert any unit to any other unit. The units must be of a compatible type. Thus, you can convert a unit of length to another unit of length, a unit of area to another unit of area, or a unit of volume to another unit of volume.You can't just convert any unit to any other unit. The units must be of a compatible type. Thus, you can convert a unit of length to another unit of length, a unit of area to another unit of area, or a unit of volume to another unit of volume.