"Ο κύκλος είναι ένα γεωμετρικό σχήμα χωρίς γωνίες."

Translation: The circle is a geometric shape without angles.

[Goren17]

I'd say it has infinitely many angles

[Howard]

Yes, "corners" would be better.

[G.Georgopoulos]

That's an accepted answer as well.