Nine millimeters- a measure of length or distance, just about equal to the thickness of a standard pencil. It is also a common caliber for a handgun cartridge.
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9 mm * 9 mm = 81 mm2 = 0.81 cm2
1 mm is the thickness of a dime. 1cm is 10 mm
1 cm = 10 mm 2 cm = 20 mm 3 cm = 30 mm . . 9 cm = 90 mm That's more than 77 mm.
A 9 mm handgun can cause a lot of damage to someone's chest and abdomen. A 9 mm handgun and kill someone.
Perimeter = 9+9+15+15 = 48 mm It's a small floor perhaps it's a doll's house.