15 is an exact number. It is a precise number.
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8.43175853 feetWould that level of accuracy be justified by the precision of the measurement of 257 cm, or the conversion factor?
1 metre = 100 cm Therefore 15 meters = 15*100 = 1500 cm
The length of the diameter will be 30 cm if the radius is 15 cm.
4*15 cm = 60 cm
Without information on the precision of the measurement, the only thing that can be said is the max length is 115 cm.