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Beret circumference calculations:
The head circumference (OH) must be divided by 3.14 and we get the diameter of the inner circle (d1).
For example, OG \u003d 56 cm. Then 56/3.14=17cm.
d1=17cm
To find the diameter of the outer circle (d2), you need to multiply d1 by 1.5.
For example (d1)17cm*1.5=27cm
d2=27cm