किसी सरिये का व्यास (dia) कैसे निकाले ? जब हमारे पास सिर्फ़ परिधि (circumfrence) हो ll(how to calculate the Dia of any rod when we don't have any end of that rod, we have only Circumference)

Dia = Circumference/3.14

It will help us when we don't have the both ends of a Rod and we need to know the Dia of Rod.