In many cases, english/metric conversions are approximate, but an inch is defined as 2.54 centimeters.
Consequently, 19 inches is exactly and precisely 48.26 centimeters.
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There are 2.54 centimetres in one inch. Therefore, 19 inches is equal to 19 x 2.54 = 48.26 centimetres.
66 inches = 167.6 centimetres
There are 24 inches in 24 inches. Perhaps you are asking how many centimetres there are in 24 inches. In which case, there are 2.54 centimetres in one inch. 24 inches is equal to 24 x 2.54 = 60.96 centimetres.
18 centimetres approximately
2.2 centimetres = 0.866141732 inches