what is the circumference of a 9 meter circle
Probably 56.55
9 meter radius= 2*pi*9 = 56.5486677646162783, or ≈56.55.
OR
9 meter diameter means there is a 4.5 meter radius. 4.5 meter radius=2*pi*4.5 = 28.2743338823081391, or ≈28.27
+5265 
