170
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No
680 of them.
29.5652174 I'm 99% sure that's it
There are 680 millimeters in 68 centimeters. 68 centimeters x 10 millimeters/1 centimeters = 680 millimeters 1 centimeter = 10 millimeters
The square root of 680 is an irrational number and it is about 26.0768 rounded to 4 decimal places