The radius of a circle with circumference of 63 m is 10.03 m
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Half the diameter is the radius. Circumference = 300 m gives radius = 47.75 metres (to 2 dp).
pi*r2 = 144 m2 => radius = 6.770275003 m circumference = 2*pi*6.770275003 = 42.539 m (rounded to 3 decimal places)
Assuming 9m refers to the radius, the diameter is 18 m and the circumference is 56.5 m
A circle with a radius of 11m has an area of ~380.13 m2
radius = 20/2*pi = 3.183098862 m