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the smallest measurement in the us
21mm
346.36 square MM.
Because you haven't told us what the measurement is.
Customary Units
12x1.5 or 21mm 12x1.5 or 21mm
21mm x 21mm = 441 square millimeters
0.021m
the smallest measurement in the us
21mm
21MM
21mm
21mm
2.1 cm 10mm = 1cm
27mm x 21mm
346.36 square MM.
Use the formula: V= 4/3*pi*r^3 I would convert 21mm to metres straight away. 21mm=0.021m Then apply the formula and you get Vol=0.000038792m^2 to 10 sig figures