So I just started illustrator two hours ago and I can't

Ai can be weird. I would create a line with the desired angle, duplicate it, and align both actual lines with those lines, like if they were guides.

File: capture-1.webm (2MB, 1300x640px) Image search: [Google]

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>>312055
copy and paste one point and align line segment then combine using the shape builder tool or pathfinder, also for square angles the stroke size and object - expand is faster. webm related

>>312058
You, my sir, are godsend. Thank you very much!

thread can be deleted/archived

all done, thanks guys!

File: 1498035725494.png (115KB, 184x184px) Image search: [Google]

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>>312061

Sorry, but this triggers me autistically hard.

File: Screenshot_20170621-070117.png (448KB, 1440x1286px) Image search: [Google]

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>>312075
I agree with this.

Also, this angle is very awkward. Try keeping the width consistent there. Maybe even rounding it off.