Help on solidwork

[gregory]

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

 

[Cadasio]

I'm with you here, unless I'm missing something, or a dimension is wrong I can't see how that is 30degrees.