i assumed the points was the sketch when i dimensioned it or modified it.
there was no ref line, except it probably made one when I use the symmetric constraint i made the ellipse, dimensioned, trimmed one side opposite from the dimensions and later came back and and modified, didn't notice that it didn't work. so i deleted the dim and go it work., thanks for looking. I always struggle with ellipses, they do not work well by dragging them
The same thing has got me a few times. After the initial confusion I figured out what was going on and got in the habit of using the advanced selector on constrained sketch figures.
After clicking on the Dimension button and about to click a sketch figure, right click and select "advanced selector". It will show all underlying figures and allow you to pick which one you would like to dimension.