Display only selected borders of object in PowerPoint

Hello,

Is there a way to display only some of the borders of an object in PowerPoint but not display others?

For example, suppose you want a half circle with the round border displayed but the straight border not displayed.

Half circles are not available from the objects menu but can easily be created by starting with a full circle as shown here:


Then after superimposing a second object which perfectly covers half of the circle:


and clicking Shape Intersect:


The desired half circle is obtained:


However, in the process, a red border was added to the new edge of the half circle.

Is there a way to prevent the addition of the new border or remove it once it is present?

Thanks