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OSHAPE drawing - perpendicular section

Hello,
I'm working on a drawing of a plate with angeled shape (triagle shape). I yould like to ask you how to do perpendicular section to a edge of a part. When I tried to do it, it is not possible for me to pick a perpendicular constrain.
T
hanks for some tips
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Answers
@milan_uher898
There are two opti ons:
https://cad.onshape.com/documents/159f2b54c9a21a587d335194/w/e45fa6207f6eb2978d80ec0d/e/dcb41cd91019fec384a686a9
Select reference line midpoint - lower left- upper right end point to place the section plane.
2. Try the "Angular" Option in the tool you already used:
Both lead to the desired result. There are differences when it comes to create jogs in the cutting line. Try which variant is best for your use case then.