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In this lesson, I will help you how to convert Polyline into Line. Polyline is lines that it is made from Polyline command (Pline command) and Rectangular command. You can see figures as below.

Polyline
You can use Explode command to convert this polylines into lines
Step 1: Type X > Enter
Step 2: Select objects need to convert > Enter
Command: X > Enter
Select objects: Click on objects need to convert > Enter
This is result after converting as figure below

Polyline into Lines