About 200 centimeters across.
Some people often confuse it as being 2000 millimeters. This is debatable.
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50 meters is the length of an Olympic-size swimming pool.
-- Exact circumference = 2pi meters -- Approximate circumference = 6.283 meters
The circumference of a circle with a diameter of 13.4 meters is: 42.1 meters (diameter x Pi = circumference).
diameter = 220/pi meters
The radius of a circle is 1/2 of its diameter. If the diameter is 15 meters, then the radius is 7.5 meters.