Question: There is a one - character section as shown in Figure A . To reduce the weight, we made 6 holes with a diameter of

There is a one-character section as shown in Figure A. To reduce the weight, we made 6 holes with a diameter of 10 cm as shown in Figure B. How much has the secondary moment of the area of the X axis changed? In other words, how much is 11? Here, the secondary moment of the area of Figure A is 1, and the secondary moment of the area of Figure B is called 1,6.
There is a one - character section as shown in

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