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SmartXoxo
I think you mean circumference.. So follow these steps:
Firstly the circumference of a circle is [tex]2 \pi r[/tex] 
r= radius
if the diameter is 120m, the radius is half which is 120 divided by 2. It gives 60m
Next, multiply 2 by [tex] \pi [/tex] and 60
It results to 377meters

hope you understand!
Snowpaw
Equation: C=d pi
C=120 time 3.14
Answer. C= 376.80
This answer is for the cirumstance.


Equation: A=pi (r)2
A= pi(60)2. You divide 120 divide by 2 so you get 60 for radius.
A= 3.14 time 3,600
Answer A= 11,304 square meter.
This answer is for the circle.

Hope it help.