Cylindrical equation: . Cubic surface. Volume between the planes  and  : .                                                                  .

The neiloid is the surface of revolution obtained by rotating a semicubical parabola (or Neile parabola) around its axis of symmetry.
 
 

In dendometry, to calculate the volume of a trunk of negative curvature, we use the neiloid trunk formula seen above, as shown in the figure opposite:

 
 

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© Robert FERRÉOL 2022