The radius is half of the diameter, so 9 divided by 2 = 4.5 So, 4 and a half yards.
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Radius is half the diameter. 18 / 2 = 9 Answer: 9.0 cm
circumference = diameter × π = 6π yards ≈ 18.85 yards
A circle with a radius of 9 inches has a circumference of 56.55 inches and a diameter of 18 inches.
radius = 18/2 = 9 cm
Circumference of a circle = 2*pi*radius or pi*diameter