Extend line past end points

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i how can extend red line, keep angle same?  i'm sure it's simple i'm missing.

hello navarro parker,

 

very simple, first trace first line using "line segment" tool following angle want duplicate.

 

after this, tool selected, hold "option" down (keyboard) , click where. new window called "line segment tool options" appear.

 

from here type length wish , click "ok"

 

i hope helps!



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