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area changes when going from 2D to 3D

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When drawing a circle the are changes when going from 2D to 3D

in a 2D drawing or in a plane a circle is drawn with radius (57,61/2)[mm] resulting in a surface of 0.002602m²

when extruding this plane or drawing a cilinder with the same radius the surface changes in 0.002585m².

What is the reason of this change?

2D diameter is then 57,5584mm
3D diameter is then 57,3701mm

why are they both differing with 57,61mm initial diameter?

Hans

0 Replies Last Post 2013年5月22日 GMT-4 03:14
COMSOL Moderator

Hello Hans Parmentier

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