> For the complete documentation index, see [llms.txt](https://docs.imerit.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.imerit.net/labeling/labeling-tools/tools/circle.md).
# Circle
Overview of the Circle labeling tool in Ango Hub
The circle labeling tool allows you to annotate using circles created out of three points.
{% hint style="info" %}
The Circle tool is supported across the Image and Video labeling editors.
{% endhint %}
## Adding a Circle tool to your project
From the project’s *Settings* tab, enter the *Category Schema* section.
Click on *Add Category*. From the list that appears, click on *Circle*.
A new row will appear named *Circle*. Click on it to expand it.
Give your circle tool a title.
Enable the *Required* toggle if you want to force labelers to create at least one circle for each asset. When the toggle is disabled, labelers will be able to save and move to the next asset without creating circles using the class you've just created.
If you would like to ask labelers further questions, for example, if you want to show a further *radio* after drawing a circle, click on *Add Classification* and add a further question. [More on nested questions here](/labeling/labeling-tools/tools/nested-classifications.md).
## Using the Circle Tool
Select a *Circle* tool from the *Tools* section in the left sidebar of the labeling editor.
Click three times on the image to create three points. They will form the circle.
To edit the circle, click on it to select it. Then, drag it by using your mouse cursor, or drag each point to edit the circle.
## Data format
{% hint style="warning" %}
In the final export, circles are represented only by the coordinates of the three points used to create them.
{% endhint %}
Please see the page on the Ango Export Format to learn how the circle appears in the final export:
{% content-ref url="/pages/X5TLHCxEmd25AH9AlKGG" %}
[Ango Export Format](/data/importing-and-exporting-annotations/exporting-annotations/ango-export-format.md)
{% endcontent-ref %}
---
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