How do I dimension an ellipse in a drawing on SolidWorks 2012

Hello

 

I currently have 2 ellipses to dimension in relation to the edges of my room but SW displays me as a message: "The selected entity could not be converted into a circular line or arc"

 

I therefore ask for your help. (I am in the first year of Bac Pro EDPI I have basic knowledge of the software)

Hello

By putting a point on the ellipsis, it should work.

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Hello

I think your ellipses are in an unfolded?? If so; In the unfolded you create a sketch then you convert the 2 ellipse and then you draw the axes in the sketch. In the drawing you make the sketch appear and then you can  dimension them.

Hello

Are you in BAC PRO EDPI in which institution?

I am in a high school near Bordeaux, the Charles Peguy vocational high school in Eysines