CATIA 2d curve projection in sketch

I want to make a pocket with extracted sketches, but when I started giving dimensions between two horizontal projected lines, it is showing something different
I have attached the file here for more clarification.

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It is nothing but the angle (note the symbol degree in dimension). If you want to make linear dimension then choose horizontal measurement or if doesn't work choose any two point (point from end of two line).

 
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