How to measure the polygon area (with arc-edges)?

1. When you encounter a straight line, left click on both ends of it. While encounter an arc, left click on the arc itself.
2. Return to the starting point to close the end automatically, and left click to put the measurement.

Attention:

1. An arc could be automatically recognized when the mouse turns into a small white square. If the mouse turns into a small yellow square, it means it’s not an arc but a polyline which consists of multiple line segments, and you need to select them one by one for measurement.
2. When encounter a broken line segment, click the endpoint to capture it before continuing to measure.
3. Defaulted drawing unit is mm, you can click the settings function to display the measurement in square meters.