How to rotate an object to make one of its side parallel to another object’s side in Adobe Illustrator?

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I have this red object and grey object.

the red and grey objects

I need to rotate the grey object around such that it fits perfectly well on red object’s line.

How do I achieve that?

Answer

Ok there are 2 tricks to know about illustrator.

Trick:

  1. You can actually measure the angle of an object with the line tool! So do the following:
    1. Draw a line along the existing line
    2. Alt click with line tool and it will display the angle. Copy this value.
    3. Rotate object with rotate tool numeric input (alt click for anchor) paste the value. (and subrtact your heading)

enter image description here

  1. I’m not so sure this is a trick but rather pointing at the points which you want to be in line. I dont really understand why people have so much problem with the concept but seems really hard fr people to come up with this.

    1. Place the object so the lines intersect.
    2. switch over to rotate tool (R)
    3. click on the intersection (you do have smart guides on?)
    4. start rotation on a different point on line you want to align
    5. rotate until you hit and snap to the line you want.*
      enter image description here

* Illustrator before CC has a really bad precision when it comes to calculating intersections. But then illustrator is no cad. Hell it can not even make perfect circles.

Attribution
Source : Link , Question Author : Daokr23 , Answer Author : joojaa

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