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2 basic questions from a bigenner

Question asked by Daniel Banana on Oct 18, 2017
Latest reply on Oct 18, 2017 by Jim Steinmeyer

1) how to I tell of the sketch is symmetric? is it enough from its "appearance" or there has to be some lines or indications?

I asked this because it's easier to use the centerline command


2) when making the extrude feature and selecting the direction"mid plane" what does it exactly do? and do I have to have a symmetric sketch for this feature?