304.8 mm
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There are 2.54 cm in one inch or 25.4 mm in one inch or (25.4)2 mm2 in 1 sq..inch. There are 144 square inches in a square foot, therefore there are (25.4)2 x 144 square mm in one square foot. This is 92,903 mm2
There are 10 mm in 1 cm and 30 cm in 1 foot. Take 10mm and multiply by 30 cm to get your answer of 300 mm in 1 foot.
305 mm is 1 foot
5.5 feet = 66 inches = 1,676.4 mm
A foot is 304.8 mm, so you have to divide by that number.