The radius is 2.23 inches.
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Circumference = 2*pi*radius or circumference/2*pi = radius 90 inches/2*pi = 14 inches in radius =======================
31.14 inches
Use: 2*pi*radius = circumference
circumference = 2*pi*14 = 87.965 inches rounded to 3 dp
Circumference = 2 x PI x radius = 28 x PI = (approx) 87.9645943"