There is no division
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If you mean equal pieces it is a centimeter.
A circle has no straight sides but if you mean a circle that has been divided into 5 equal sectors then the angle of each sector is 72 degrees subtended by each arc of the circle.
0.2857
It is the sum of the observed values divided by the number of observations. Each observed value is given equal weight or treated with the same degree of importance.
0.0455