CM represents the word centimeters as an abbreviation in the metric system. It is ahttp://wiki.answers.com/wiki/Units_of_measurement of http://wiki.answers.com/wiki/Length in the http://wiki.answers.com/wiki/Metric_system, equal to one hundredth of a meter.
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3.5 cm is equivalent to 0.000035 km (or 3.5 x 10-5).
0.00001 km = 1cm
8.5 x 10-5 km ;-)
It depends on the percentage. A 1 cm arc of a circle whose radius is 1 cm will represent 100*1/(2pi) % = 50/pi % and that is an irrational percentage. A semicircular arc of the same circle will represent 50%, which is rational.