An diofar eadar na mùthaidhean a rinneadh air "Cearcall"
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Loidhne 17:
=== Formula airson Cuairt Loidhne ===
O chionns gu bheil '''π = C/T'''
C = π×T▼
▲'''C = π×T
'''
Ach, far a bheil r a riochdadh reidius a' chearcaill, o chionn's gu bheil T = 2 × r
'''Cuairt-Loidhne = 2 × π × reidius'''
Sgriobhta gu abhaisteach : '''C = 2.π.r
'''
=== Formula airson Achar ===
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