The area is the sum over every face, computed from the exact surfaces. A flat face is measured to a relative error of about 1e-9, whatever its edges. A curved face is measured as Open CASCADE integrates it: exactly for a cylinder, a cone, a sphere or a torus, to about 1e-4 for a face swept from a spline. The empty shape has area zero.

It is what a coating, a plating or a coat of paint is reckoned by.

 ## A sphere of radius 10, whose area is 4 pi r^2
 area (solid.sphere (10))
 ⇒ 1256.6

See also: solid.Shape.volume

Source Code: solid.Shape