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12 dozens in a carton?
The distance around a circle is the Circumference (C). C= pi*d If 12' is the diameter (d), then C= 12*pi= 12*3.14= 37.68 ft (approximately).
d=C/pi d= 12/3.14159 = 3.819721860586518 meters
Days of Christmas
12 Picture cards in a deck