# Arc of a specific radius issue

**URL:** <https://discourse.shapr3d.com/t/arc-of-a-specific-radius-issue/31905>\
**Category:** Modeling Questions\
**Created:** [May 14, 2024, 8:54pm UTC](https://discourse.shapr3d.com/t/arc-of-a-specific-radius-issue/31905 "2024-05-14T20:54:57Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Donnercruz](https://avatars.discourse-cdn.com/v4/letter/d/7ba0ec/32.png) [@Donnercruz](https://discourse.shapr3d.com/u/Donnercruz)\
**Post date:** [May 14, 2024, 8:54pm UTC](https://discourse.shapr3d.com/t/arc-of-a-specific-radius-issue/31905/1 "2024-05-14T20:54:57Z")

</div>

Im trying to create a arc between two fixed points. The arc needs to have a specific radius. This is a guitar fingerboard. I worked on the bottom end of the board first, creating the two lines a specific distance from each other. I locked the end points and created an ac, then set the radius. It worked perfectly (the arc was the bottom of a circle, think smile.)

I then went to do the same thing on the top end of the fingerboard. Same process. Two lines, locked end points, created the arc. But when I go to set the radius, it creates a circle with the piece I want missing.

Btw- I’m on my iPad.

Here is the bottom arc finished

 ![IMG_0614](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/c/1/c1515043672a7d4bc44c516ab1c42bbeee47ebb4.jpeg)

Here is the top arc with issue

 ![IMG_0615](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/1/0/1086fc301fc69c685340d4ed13e86d9398b70553.png)

Here is a video trying to add the arc. It appears that Shapr3d is making a giant arc with the right radius, but making the points the bottom of the arc/radius rather than the top. Not sure how to fix it.

> **[Submit a request – Shapr3D Help Center](https://support.shapr3d.com/hc/en-us/requests/new)**