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51.06 centimeters is equal to 20.08 inches.
This is slightly shorter than the length of a standard school ruler, which is 30 centimeters or 12 inches.
It is also slightly shorter than the diameter of a standard basketball, which is 24.5 centimeters or 9.65 inches.
However, it is taller than an average paperback book, which is around 19 centimeters or 7.5 inches tall.