Kerning is a term used by the printing trade to describe the spacing between letters on a page ( of paper or on screen) and prevents the problem of words looking fine when there is a full line of text but all crowded in one corner on the next - like this line
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Leading is the space between lines of type. Tracking refers to the distance between letters in general, while kerning refers to the spatial relationship between a set of two letters.
You would use area. I would use the meter2. Okay
If I was you i would use millimetres or centimetres.
who would use the word "quadrant"
I would use a micrometer. A caliper would do as well.