# Simple 2D Problem

**URL:** <https://discourse.mcneel.com/t/simple-2d-problem/205197>\
**Category:** Rhino\
**Tags:** windows\
**Created:** [May 29, 2025, 7:16pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197 "2025-05-29T19:16:11Z")\
**Posts on this page:** 14\
**Page:** 1

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**Author:** ![Carl\_Mesrobian](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/carl_mesrobian/32/769805_2.png) [@Carl\_Mesrobian](https://discourse.mcneel.com/u/Carl_Mesrobian)\
**Post date:** [May 29, 2025, 7:16pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/1 "2025-05-29T19:16:11Z")

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I want to move the selected circle down until it hits the curve on the right and also stays tangent to the vertical line on the left . The circle diameter has to be held, and the 2 lines have to be held.

This type of stuff makes me go to the cookie jar and eat a pile of shortbread cookies, but still remains a problem.

Thanks ahead!

 ![C__Users_cmgui_CAD_Musical Instrument_Mandolin_F Style Plans_Mesrobian_F5_F5 Scroll 3.3dm (16 MB) - Rhino 7 Commercial - Top 5_29_2025 3_08_20 PM](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/f/0/2/f02dc20ed6a824344ae465c2865dadc5833020b8.png)

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**Author:** ![martinsiegrist](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/martinsiegrist/32/498369_2.png) [@martinsiegrist](https://discourse.mcneel.com/u/martinsiegrist)\
**Post date:** [May 29, 2025, 7:26pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/2 "2025-05-29T19:26:31Z")

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Circle tan tan tan would be easier than moving / scaling the circle

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/8/9/c/89cbed3f7b1ec62178ac145a302721ae0b4225d5.png)

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<div class="post-metadata">

**Author:** ![ssommerv](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/ssommerv/32/688165_2.png) [@ssommerv](https://discourse.mcneel.com/u/ssommerv)\
**Post date:** [May 29, 2025, 7:29pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/3 "2025-05-29T19:29:45Z")

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Or if the circle has to stay the same size, use `Circle`, `Tangent`, pick the vertical curve as the first curve, the right curve as the second, and then input the radius of the circle.

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<div class="post-metadata">

**Author:** ![Carl\_Mesrobian](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/carl_mesrobian/32/769805_2.png) [@Carl\_Mesrobian](https://discourse.mcneel.com/u/Carl_Mesrobian)\
**Post date:** [May 29, 2025, 7:46pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/4 "2025-05-29T19:46:37Z")

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The circle is a cutting tool diameter - has to be fixed. I will edit the post.

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<div class="post-metadata">

**Author:** ![martinsiegrist](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/martinsiegrist/32/498369_2.png) [@martinsiegrist](https://discourse.mcneel.com/u/martinsiegrist)\
**Post date:** [May 29, 2025, 7:48pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/5 "2025-05-29T19:48:21Z")

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Ok got it…

If you want to move it, offset the two tangent curves and find the intersection?

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<div class="post-metadata">

**Author:** ![Carl\_Mesrobian](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/carl_mesrobian/32/769805_2.png) [@Carl\_Mesrobian](https://discourse.mcneel.com/u/Carl_Mesrobian)\
**Post date:** [May 29, 2025, 7:48pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/6 "2025-05-29T19:48:38Z")

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I tried that, but it changed the circle to an ellipse. I’ll upload a file.

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<div class="post-metadata">

**Author:** ![martinsiegrist](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/martinsiegrist/32/498369_2.png) [@martinsiegrist](https://discourse.mcneel.com/u/martinsiegrist)\
**Post date:** [May 29, 2025, 7:53pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/7 "2025-05-29T19:53:27Z")

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Did you use the gumball?

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<div class="post-metadata">

**Author:** ![Carl\_Mesrobian](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/carl_mesrobian/32/769805_2.png) [@Carl\_Mesrobian](https://discourse.mcneel.com/u/Carl_Mesrobian)\
**Post date:** [May 29, 2025, 7:59pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/8 "2025-05-29T19:59:45Z")

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I am uploading the file, but noticed after hitting F10 to see the points, neither object is a circle or arc - does it have to be???

 ![C__Users_cmgui_CAD_Musical Instrument_Mandolin_F Style Plans_Mesrobian_F5_Forum.3dm (142 KB) - Rhino 7 Commercial - Top 5_29_2025 3_56_06 PM](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/d/a/4/da432aa69b8da191ed243194ce9195c3ea91e430.png)

[Forum.3dm](https://discourse.mcneel.com/uploads/short-url/5RUMFE2PV3hvvwhgmy3hS7FOG48.3dm) (143.8 KB)

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<div class="post-metadata">

**Author:** ![ssommerv](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/ssommerv/32/688165_2.png) [@ssommerv](https://discourse.mcneel.com/u/ssommerv)\
**Post date:** [May 29, 2025, 8:01pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/9 "2025-05-29T20:01:52Z")

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Ahh, I think I see why it’s making it an ellipse. Your curves aren’t planar, so it’s making a circle that’s tangent between a curve on one plane and a curve on another. Is that intentional?

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/2/b/3/2b3480eab8e6d497e54b67d492a89ecde4d463d5.png)

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<div class="post-metadata">

**Author:** ![Carl\_Mesrobian](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/carl_mesrobian/32/769805_2.png) [@Carl\_Mesrobian](https://discourse.mcneel.com/u/Carl_Mesrobian)\
**Post date:** [May 29, 2025, 8:02pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/10 "2025-05-29T20:02:08Z")

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The circle has to be fixed diameter but is moveable, and the 2 curves have to stay put.

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<div class="post-metadata">

**Author:** ![Carl\_Mesrobian](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/carl_mesrobian/32/769805_2.png) [@Carl\_Mesrobian](https://discourse.mcneel.com/u/Carl_Mesrobian)\
**Post date:** [May 29, 2025, 8:02pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/11 "2025-05-29T20:02:47Z")

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Oops, Thanks!! I probably used the curve from the 3D model.

I’ll project a copy to the XY plane!

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<div class="post-metadata">

**Author:** ![martinsiegrist](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/martinsiegrist/32/498369_2.png) [@martinsiegrist](https://discourse.mcneel.com/u/martinsiegrist)\
**Post date:** [May 29, 2025, 8:02pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/12 "2025-05-29T20:02:57Z")

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Move the entire circle. Don’t scale it and don’t press F10…

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<div class="post-metadata">

**Author:** ![ssommerv](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/ssommerv/32/688165_2.png) [@ssommerv](https://discourse.mcneel.com/u/ssommerv)\
**Post date:** [May 29, 2025, 8:08pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/13 "2025-05-29T20:08:07Z")

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![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/9/6/7/9673bbfd79040cf0842e43775dbbefecc60f1da4.png)

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/e/7/0/e701822888ff10aaced9abb4e6a71f03c4cee76e.png)

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<div class="post-metadata">

**Author:** ![Carl\_Mesrobian](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/carl_mesrobian/32/769805_2.png) [@Carl\_Mesrobian](https://discourse.mcneel.com/u/Carl_Mesrobian)\
**Post date:** [May 29, 2025, 8:15pm UTC](https://discourse.mcneel.com/t/simple-2d-problem/205197/14 "2025-05-29T20:15:16Z")

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Thanks, I understand. I was not analytical enough and only had top viewport open, another vote for 4 viewport !