grade plane

grade plane

A reference plane representing the average of the ground level adjoining a building at its exterior walls.
References in periodicals archive ?
(See, I did remember something from 10th grade plane geometry!) Three points determine a plane; three legs make a stable chair or stool; there are three separate, but equal, parts of the federal government, and for that matter, most local governments.
Geometry 101: the equilateral triangle
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