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How can I merge a semicircle with two parallel lines? I want to have the leftmost point of the semicircle to bind with the leftmost line in the illustration below, and I'd like the rightmost point of the semicircle to be bound to the rightmost line simultaneously:

enter image description here

I'm using Illustrator (16.0.3).

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marked as duplicate by Bakabaka, Random O'Reilly, Ryan, JohnB Apr 28 at 23:24

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.

    
It's got to be a circular arc. I don't want to use splines. –  Black Like Me Dec 12 '13 at 22:49
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3 Answers 3

Looks like you are trying to recreate paths from a scan. I've had to do this more times than I care to admit. Try this:

enter image description here

If you can't read the image, the steps are:

  1. Draw the circle
  2. Draw a rectangle, snapping the corners to the nodes on the circle.
  3. Select both, rotate around the center of the circle
  4. Pathfinder > Weld
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Hmm... This is good. Thank you. Perhaps you might be able to help me with a second question. –  Black Like Me Dec 13 '13 at 0:04
    
I think I already may have. :) –  TunaMaxx Dec 13 '13 at 0:05
    
Did you download the .ai file I linked to in the second question? I can't seem to tell if all the lines are connected. Do you have any familiarity with issues that might occur in sending these path files to a laser cutting company? If there is a small 0.01mm gap between paths will the laser go berserk? –  Black Like Me Dec 13 '13 at 0:14
    
Let's keep the comment for the other question over there. I'll go look at the file. –  TunaMaxx Dec 13 '13 at 0:16
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Align the end anchors using the Direct Selection Tool (the white arrow), select the aligned anchors (still using the Direct Selection Tool), and then choose Object > Path > Join from the menu.

Or you could simply use VectorScribe's Dynamic Corners tool on a rectangle...

corners

Note: I am not compensated for mentioning VectorScribe.

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Well, if you were compensated, you'd be getting a kickback right now. I'mma bought to go buy that! –  TunaMaxx Dec 13 '13 at 0:27
    
@TunaMaxx The Astute Plugins (all of them) are by far worth every penny. Much more so than any other AI plug in I've ever seen.. including the old Kai plug ins (if you remember those). –  Scott Dec 13 '13 at 0:29
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While Scott's answer is excellent and simple, it's sometimes a hassle to align the arc and the lines. That's why I thought I'll suggest a different approach, which I admit can also be a hassle. But another perspective never hurts. I've used your image as an example. The letters between parenthesis indicate the keyboard shortcut.

  1. Make a rectangle that has the same heigth as the distance between the two parallel lines and rotate it such that it fits the image:
    enter image description here
  2. Delete the lower line with the Direct Selection Tool (A).
    enter image description here
  3. Cut the lines with the Scissors Tool (C) at the appropriate place by clicking on the place where you want to make the cut. Delete the unnecessary parts of the line.
    enter image description here
    enter image description here
  4. Measure the width of the rectangle, i.e. the distance between the two parallel lines. The Measurement Tool is found under the icon of the Eye Dropper Tool. Drag from point 1 to point 2 and read out the distance marked by D. In this case it's 340px.
    enter image description here
    enter image description here
  5. Select the rectangle (or what's left of it) with the Selection Tool (V). Go to Effect -> Stylize -> Round Corners. Type in 340/2 as the radius:
    enter image description here
  6. And this is your result:
    enter image description here

Nice thing is that this scales as you scale the "rectangle" and you can change the radius later on by going to the Appearence pane and clicking on the underlined Round Corners link. enter image description here

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1  
The rounded end looks a little wonky. Is it just an artifact of the screen shot, or did Rounded Corners actually product that hump on the right side? –  TunaMaxx Dec 13 '13 at 0:15
    
It's not a hump, it just doesn't align correctly with the underlying image. One could decrease the radius slightly to hug the corner a little tighter. Or the rectangle can be scaled down a bit. But the Weld options works better anyway. –  Bart Arondson Dec 13 '13 at 6:16
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