Editing polylines

- [Narrator] Now that we've created a number … of polylines in different ways, let's see … what the geometry of these shapes really involves … and how they're different from normal line segments. … I'm going to select the rectangle, … that we see here on the screen, … and we can see that it is a single polyline made up … of four line segments that share end points. … I can select any of the end point grips … and stretch the rectangle, … but we can see it's no longer a proper rectangle, … but it is still a polyline. … I'm going to click on Undo, select the rectangle again, … but this time, instead of one of the end vertices, … I'm going to choose one of the midpoint vertexes here. … And we can see that this does actually stretch … and maintain the parallel relationship between the objects. … I'm going to press Escape, … and take a look at the larger polyline right here. … This was created with a polyline tool, … and again, I can modify any of the grips … just by clicking and dragging, …