The radius is the distance from the center to the outer edge of the circle. You can measure the diameter, the distance from side to side, and divide by 2.
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Radias
Assuming you mean the radius, which is half of the diameter: 4.56 m ÷ 2 = 2.28 m
all you have to do is find a line with two endpoints on the circle also a diameter is the longest chord on a circle that runs through the middle of the circle.
Find the area of the circle and divide by 4.
Area of a circle = pi*radius2