1550s, from Middle French cube (13c.) and directly from Latin cubus, from Greek kybos a cube, a six-sided die, vertebra, perhaps from PIE root *keu(b)- to bend, turn..
The triangle illustrates the three elements a fire needs to ignite: heat, fuel, and an oxidizing agent (usually oxygen). A fire naturally occurs when the elements are present and combined in the right mixture, meaning that fire is actually an event rather than a thing. A fire can be prevented or extinguished by removing any one of the elements in the fire triangle. For example, covering a fire with a fire blanket removes the oxygen part of the triangle and can extinguish a fire.
there are three requirements for fire: 1. Fuel (ie the material to burn) 2. Oxygen (ie from the air around) 3. Heat source (ie spark) These are the basis of fire and this is the list that fire extinguisher work on to extinguish the fire. I.e. a Co2 fire extinguisher works by blanketing the fire with Co2 to remove the oxygen.