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I have no idea what im doing wrong, please help

Question asked by Aryan Panthri on Jun 1, 2020
Latest reply on Jun 3, 2020 by Shawn Chi

First off, I'm not sure if this if the correct discussion board to post out of all, sorry if it's in the wrong place

I tried making this part and I'm not getting the correct mass, please help me

The correct answer is 'C'

(Dimensions and the model given below)