This article is about the original Diep.io Tri-Angle. For the Arras.io equivalent, see Arras:Tri-Angle. For the red Polygon, see Triangle. The Tri-Angle is a Tier 3 tank in Diep.io. It upgrades from the Flank Guard at level 30 and upgrades to the Fighter and Booster at level 45. The Tri-Angle features a circle body with a Basic Tank's cannon mounted at the front, and two propulsion barrels on its rear. The Tri-Angle has three Barrels. One faces the front and deals considerable damage. The other