Rules
Competitors take their throw from inside a marked circle 2.135 metres (7.00 ft) in diameter, with a stopboard approximately 10 centimetres (3.9 in) high at the front of the circle. The distance thrown is measured from the inside of the circumference of the circle to the nearest mark made in the ground by the falling shot, with distances rounded down to the nearest centimetre under IAAF and WMA rules.
Read more about this topic: Shot Put
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