Summary  
How to programmatically add and configure a trendline object on a chart, specifying its model type (e.g., linear, polynomial), forecast range or order, and visual style properties (color, width, etc.).

General domain of usage  
Data visualization and analysis

**Trendlines** help identify patterns and highlight overall trends in data.

In this lesson, you will learn how to add a trendline to a chart and customize its color, width, and style to make trends clearer and easier to interpret.

Task Template

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- Add a **Trendline** using the **Chart Design** tab → **Chart Layouts** group → **Add Chart Element** → **Trendline** (e.g., Linear);
- Open **Format Trendline** by right-clicking the trendline to customize its settings;
- Adjust the **Forecast Forward** value to extend the trendline into future periods;
- Change the trendline type to **Polynomial** and set the required **Order**;
- Modify the **line color** and style in the formatting options to make the trendline more visible.

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Adding Trendlines to Excel Charts

Key Points