How to reshape an arc

Let’s say you have an arc that extends from about 30 degrees to 80 degrees. How do I modify the arc so it encompasses a different angular range?

A more universal question: In Appleworks, there is a “reshape” command that can be used for many shapes. With arcs for example, it would put grab handles on the ends of the arc and you reshape. Does LibreOffice Draw have anything like this?

Right click > Edit Points