Circular Mil - What is it?

An area measure mostly specific to electricity related studies, is the circular mil (CM). What is a circular mil?

[@andresduran4363]

Great explanation. Best regards from Bogotá.Colombia.

[@习近平-m5l]

so, what you mean is that the area of a squere is equa to the area of a circle even they have the same value of sides? Length=2mm=diameter?

[@216kingDavid1]

This is great 👍🏽

[@samalfellah2066]

Thanks for the great explanation

[@golammostafa6849]

why CM= d^2, not pi.d^2/4, please explain.

[@Brovillion559]

Different methods. Both work