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Karkara na da'irar (kewaye da'irar) dabara kalkuleta

Circumferenc na da'irar (kewaye da'irar) dabara kalkuleta ba ka damar samun karkara (kewaye) na da'irar, da dabara, ta yin amfani da radius daga da'irar.
Radius (r):

Karkara na da'irar

A da'irar ne sa dukan maki a cikin wani jirgin saman da suke a iyakancen nisa daga wani da aka ba batu, cibiyar.
Formula for karkara na da'irar: p = 2πr,
inda r - radius daga da'irar, π = 3.14159