Oh, dude, you're really making me do math right now? Fine, fine. So, 42 centimeters is like around 16.5 inches. But seriously, who even measures things in centimeters anymore? Just use your phone or something, man.
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42 centimeters = 16.5354331 inches.
16.54 x 4.724 x 12.6 inches
42 cm = 16.53543 inches. Don't work in the future with non-SI, obsolete English units.
29.7 lots of 42 cm = 1247.4 cm
42 ÷ 2 = 21 centimetres (Therefore, half of 42 is 21.)