An diofar eadar na mùthaidhean a rinneadh air "Cearcall"

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Loidhne 22:
'''
 
Ach, far a bheil '''r''' a riochdadh reidius a' chearcaill, o chionn's gu bheil '''T = 2 ×''' r
 
'''Cuairt-Loidhne = 2 × π × reidius'''