21 cm =   8.26′

30 cm = 11.69′

40 cm = 15.74′

45 cm = 17.71′

50 cm = 19.68′

60 cm = 23.62′

75 cm = 29.52′

80 cm = 31.49′

90 cm = 35.43′

100cm = 39.37′

120cm = 47.24′

150cm = 59.05′

200cm = 78.74′

225cm = 88.58′

375cm =147.63′