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Not Exact -F (x*y*z) Cylinderal 3D Model
Not Exact -F (xyz) Cylinderal:
A + B = INFINITE, a + b = finite (zero : 0), a - b = -f, b - a = +f, (-f) + (+f) = 0 (zero : exact), (-f) * (+f) = -F (not exact).
In Tinkercad: https://www.tinkercad.com/things/5svxYvTRRnU