Drawing Entities
You can use drawing tools to create new entities such as Lines, Arcs, and Circles.
You can use the command window, the Draw menu, or the Draw toolbar to invoke drawing tools.
Construction tools such as InfiniteLine, Ray, and Point are helpful when constructing a drawing.
As you draw, you might be prompted to specify points such as the center point of a Circle, or the start and end point of a Line. You can enter coordinate values at the command prompt or within the drawing.
To use the drawing tools efficiently, use the coordinate input and EntitySnap options.
To modify the entities use the Modify menu or toolbar.