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Problem in sample CSWP-SMTL exam

Question asked by Mandeep Singh on Feb 4, 2016
Latest reply on Feb 15, 2016 by Martin MacDonald

So the question is from CSWP-SMTL sample exam in question 5. I am getting all questions right, but for question 5  my area is 40923.91mm ^2 , but it should be 42963.25 mm^2 ,

 

Can somebody plz tell me my mistake .

 

I have attached both the question and my solution

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