You can use the following formula:
C=2r∙3.14
Therefore C=2∙14∙3.14
Find the product of 2 and 14 which equals 28.
Now C=28∙3.14
Find the product of 28 and 3.14 which equals 87.92.
Therefore the circumference is 87.92ft.
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The radius is 2.23
Circumference = 2*pi*14 87.96459430051421
Circumference = 2 x PI x radius. So, if circumference = 14 x PI, then the radius is 7
87.92 m
circumference = 2*pi*14 = 87.965 inches rounded to 3 dp