An diofar eadar na mùthaidhean a rinneadh air "Reidius"

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Loidhne 2:
 
Is '''lar''' ainm airson '''puing meadhanach'''.
 
Seo reidius dhen chearcall leis a' chearcall-thomhas ''C'':
 
: <math>r = \frac{C}{2\pi}.</math>