It is: 44/2 = 22
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4.4
0.5 x 44 = 22
44
Divide the 44 inches by 3.14 and take half of this. That is your radius.
440 divided by 10 gives you 10%, which is 44. Half of 44 must be 5%, which is 22. So 44 + 22 = 66, which is 15%.