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For the second problem you will have to build an assembly. Thats a pretty advanced model for someone who is new to pro/e. I am assuming you are new to...

With your first problem. you need build your part with multiple sketches, or after extruding the part go back and cut the different pieces of your part to length. In...

Here is a short list of freebies i know about smath -> Very similiar to mathcad my favorite and most used of the freebies google sketch-up -> pretty good for...