# Reference Line

### **Step 1: Length**

Go to the **Analyze** tab and use the **Length** command to measure the length of the reference curve.

![](https://www.rhinoartisan.com/wp-content/uploads/2024/07/Analyze_lenght-1024x132.png)

### **Step 2: Curve** Length

In this case it is **75.067** millimeters.

![](https://www.rhinoartisan.com/wp-content/uploads/2024/07/Circle-Lenght-1024x190.png)

### **Step 3: Line From Mid Point**

In the **Curve** tab, under the **Line** submenu, select **Line From Mid Point**.

![](https://www.rhinoartisan.com/wp-content/uploads/2024/07/MidPoint-1024x190.png)

### **Step 4: Create the Line**

From the **Top View** and with **Grid Snap** activated, select a center point below the elements.

Now, type the length of the curve followed by `/` and **2** to divide the measurement and create the correct line length.

![](https://www.rhinoartisan.com/wp-content/uploads/2024/07/Point-1024x190.png)

### **Step 5: Analyze**

Analyze this line to ensure it has the same length as the reference curve.

![](https://3375153115-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F5uhW8FwQpXQj8tHUULMo%2Fuploads%2FyxJ8irDwWLd4QYvKfw62%2FGroup%2088.png?alt=media\&token=c7d5d995-f77d-412c-b04a-2279ffca7112)

### **Video Lesson**

{% embed url="<https://www.rhinoartisan.com/wp-content/uploads/2024/07/Lesson-2-1.mp4>" %}

**Next Step:** Insert the reference image and adjust the curves to start building the pattern.