Using DIVIDE and MEASURE commands of AutoCAD you can divide 2D drawing objects like Line, Polyline, Arc, Spline and Ellipse in equal parts without knowing their length.

These commands will not split the geometry instead at every division a point will be added. The commands can be used on open geometries like an arc and also on closed geometries like a circle.
DIVIDE command:
In order to divide the geometry into a fixed number of divisions use DIVIDE command. For our case, I will use a spline.

Select Divide tool from expanded Draw panel of Home tab, you can also use its command equivalent DIVIDE. Click on the spline and enter the number of segments in which you want to divide the spline, I will select 6 segments for our case. Press enter to exit the command.

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