0.021m
12x1.5 or 21mm 12x1.5 or 21mm
21mm
21MM
A 21mm measurement is roughly equivalent to the diameter of a small coin, such as a quarter or a large button. In terms of visual size, it is about the width of a standard paperclip or slightly larger than the size of a typical fingernail. In photography, a 21mm lens would provide a wide-angle view, capturing more of the scene than a standard lens. Overall, 21mm is a compact size that can be easily conceptualized with everyday objects.
27mm x 21mm
21mm
2.1 cm 10mm = 1cm
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
21mm equals 2.1cm1cm = 10mm1mm = 0.1cm
The surface area is 5,541.77 mm2