It will make the circumference of the circle bigger or smaller
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The circumference also doubles.
pi is the circumference divided by the diameter. it is a set universal constant and will never change = 3.1415...
No. The units don't matter, the circumference always equals pi times the diameter. (This is only true of the circumference and diameter are in the same units. If for example, the circumference was in feet and the diameter in inches, the feet must be change to inches or the inches to feet in order for this relationship to be true.)
Circumference is Pi x Diameter so do Circumference divided by Pi to get the diameter :)
diameter = circumference/pi