The circumference of a circle is 2*Pi*R (Pi~3.14) so:
2*Pi*R = 27.5
Pi*R = 13.75
R = 4.37 cm
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275
275
275 is divisible by: 1, 5, 11, 25, 55, 275.
275
The multiples of 275 (which are infinite) are all divisible by 275, including these: 275, 550, 825, 1100, 1375, 1650, 1925, 2200 . . .