0.9 centimeters, or a little over a third of an inch (0.3543 inches). About half the width of a finger.
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9 mm * 9 mm = 81 mm2 = 0.81 cm2
25.4 mm = 1 inch 9 mm = 0.354 inch (rounded) That's a touch longer than 1/3 inch.
It is exactly 29.5 mm long.
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.