19mm is more precise. 19mm = 1.9cm
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82 mm is more precise because you are missing 0.2 for 8 cm. If you want your number in cm then 8.2 cm is just as precise as 82 mm.
634 mm.
6x30cm=180cm 182.88 to be more precise. 1 foot = 30.48 cm.
About 157 cm. 157.48 cm if you want to be precise.
Perimeter of square: 19+19+19+19 = 76 cm