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You can place a string around the head, and then measure the string. Or measure directly with a measuring tape, if you have one that is flexible enough (basically, a measuring tape made up of cloth or something similar).
It has a circumference of 333.01 feet.
The circumference of a circle with radius measuring 28cm is about 175.9cm (C = r x 2 x Pi).
Measure it with a measuring tape.
what is the average head circumference of a 5 year old boy