A circle with a radius of 16 inches has a circumference of 100.53 inches.
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2 inch radius = 12 9/16" circumference & an area of 12.56637 sq. inches.
16 inch circumference: radius = diameter / 2. diameter = circumference/pi, so radius = 16 in / 2 / pi = (8/pi) inches [approx 2.55 inches] 16 inch diameter: radius = diameter / 2 = 16 in / 2 = 8 inches.
12 inches times pi (3.14) = 37.68 inches or 37 11/16"
If 75% = 48*pi then 100% = 64*pi Radius = 8 inches Circumference = 16*pi inches
Radius of circle: 16/2 = 8 inches