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Help on solidwork


hi guys, I get stuck on make the model in the SolidWorks book. As you see on the (untitled.jpg) there is a flat top pyramid on the right side of the object I need to make. When I work on it I can not get the shape I want with a 30 degree and 160inch length. If I use the boss-Extrude, I can set it to be 30 degrees and 160inch, but It will become a sharp head pyramid( which not have full 160in length) Do anyone know is there any way I can make the shape like the below diagram. THX
Screenshot (102).pngScreenshot (103).pngScreenshot (104).png
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