Dean was quicker
But explode the Ellipse first so everything is Polyline before trim, then Join Polyline, then Select the profiles with Edit tool to make sure they are closed, 1 by 1, then Convert to curve 1 by 1, i set it to 10 mm.
The blue ones did not come out correct for whatever reason, so i delete the original and Mirror copy the red ones, and finally give all a thickness.
BTW, when you offset an Ellipse it will become a spline, hence the other tread about the subject, that is as designed in TC
V20, V21, 2015/ 16/ 17/ 18/ 19 Pro. Platinum
Deluxe 2015/ 16/ 19
Windows 10 Home Premium 64 bit, 32 GB
NVIDIA Geforce GTX 780m, 1 GB