Radius = 471/(2*pi) = 74.9619782 or about 75 metres
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2*pi*radius = perimeter or circumference of a circle radius = circumference/2*pi
A line of any length may act as the radius of a circle. The radius is the distance from the centre to the perimeter of a circle.
No because the perimeter of a circle is its circumference
The radius of a circle is a line that starts at the center of the circle and ends somewhere along the perimeter of the circle. The diameter is a line that starts at the perimeter of a circle, goes through the center of the circle, and ends at the opposite perimeter of the circle. This a diameter is twice as long as a radius and can be thought or as consisting of two radii.
perimeter = pi * diameter, or 2 * pi * radius