it depends on what type of measurement you are using
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A balloon is an oval so perimeter of an oval is:
Perimeter = 2π√(a² + b²)/2
So for a balloon with 'a' being 25cm and 'b' being 15cm (kind of average)
Perimeter = 2π 10.60660171779821
Balloons are rarely (if ever) spherical, so you need to decide what you mean by its circumference.On possible way is to make a slip-knot noose with a piece of string. Slide the noose over the balloon, keeping the string tight. The noose will be opened to the extent of the balloon's circumference.
mine is 620mm is that too big?? i think the average circumference is about 570 for men mine is 620mm is that too big?? i think the average circumference is about 570 for men
46
31 inches
A circumference is 4