The radius is 15 feet
2r=30
30/2=15
15 is the radius
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Diameter = Radius*2 = 30 cm.
Radius: square root of (2808/pi) = 30 feet rounded Diameter: 2*30 = 60 feet
15mm
15 cm
The circumference of a circle with a 30 ft radius is approx 188.5 feet.