42 ÷ 2 = 21 centimetres
(Therefore, half of 42 is 21.)
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42 centimeters = 16.5354331 inches.
29.7 lots of 42 cm = 1247.4 cm
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.
It's not a circle if it's radius of 5 degrees. If it's 5 cm radius, then 12 circles.