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This question already has an answer here:

I have a shapefile which contains a 20 hectare polygon. I want to demarcate 9,48 hectares from the entire polygon with a parallel.

I can make the parallel line with the longer line but I can not do the incision...

Can you help me how to do the incision?

enter image description here

marked as duplicate by Joseph qgis Nov 7 '16 at 10:18

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Welcome to GIS:SE @Lassus! Using the Split Features tool, you use the left-mouse button to draw the lines and the right-mouse button to split the feature. I'm assuming that's what you meant by "incision"? You can find more information from the QGIS docs. – Joseph Oct 26 '16 at 9:33
  • Most welcome, glad it worked! I will mark this as a duplicate question as it has been asked and answered before :) – Joseph Nov 7 '16 at 10:18