# Active area
## Introduction
The **active area** of a drawing tablet is the rectangular region of the tablet's surface that detects the EMR pen. Some manufacturers, such as Wacom and XP-Pen, use the term **active area**, while others, such as Huion, use the term **working area**.
When we talk about the "size" of the drawing tablet, we are referring to the active area.
## Active area of pen tablets
The active area is usually marked in some way on the surface. Sometimes it is marked at its four corners. Some tablets show a grid of dots.
 
## Active area of pen displays
The active area of a pen display is easy to identify because it is exactly the same area as the display panel.
## Size
Usually, when we discuss the size of an active area, we mean its diagonal length. Drawing tablets vary quite a bit in active area size. More here: [Active area size](/drawtab/core/active-area/active-area-size.md).
## Aspect ratio
The relationship between the width and height of the active area is its aspect ratio. More here: [Active area aspect ratio](/drawtab/core/active-area/active-area-aspect-ratio.md).
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://docs.sevenpens.com/drawtab/core/active-area.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.