Convert polyline to mesh
Converts polylines to mesh objects
Button: 
Command name: PolylineToMesh
Use PolylineToMesh to create meshes by filling the space between other objects such as arcs or circles.
- Select the polyline that you want to convert into a mesh object.
- Specify the desired thickness. To do this, click on the polyline and drag the mouse pointer until the desired thickness is reached or enter a value in the command line.
- Specify whether the top and bottom edges should be invisible. To do this, enter the first letter of Yesor Noin the command line. Confirm the entry with the Enter key.