It is to cut the flow of air around the plane. That is to reduce the drag caused by air. Triangular wings are more aerodynamic than any other shape.
ANSWER
Triangular shaped wings are better for supersonic flight. You will hardly see a slow aircraft or an older prop aircraft with triangular wings. The USAF F-102, F106 and the Swedish Viggen and many other fighter jets had triangular wings. The XB-70 Bomber and the Concorde also have triangular wings.
The disadvantage is that they do not fly good at slow speeds. As they pitch up to increase the angle of attack and get more lift, the shape of the wing will stall. These jets have to land faster than other fighter jets that have wings of other design shapes.
Richard M. Wood has written: 'The natural flow wing-design concept' -- subject(s): Aerodynamics, Supersonic, Airplanes, Design and construction, Drag (Aerodynamics), Supersonic Aerodynamics, Triangular Wings, Wings, Wings, Triangular 'Influence of airfoil geometry on delta wing leading-edge vortices and vortex-induced aerodynamics at supersonic speeds' -- subject(s): Aerodynamics, Supersonic, Airplanes, Supersonic Aerodynamics, Triangular Wings, Wings, Triangular 'Study of lee-side flows over conically cambered delta wings at supersonic speeds' -- subject(s): Aerodynamics, Aerodynamics, Supersonic, Delta wing airplanes, Delta wings, Supersonic Aerodynamics, Supersonics
Alexander Lippisch has written: 'The Delta Wing' -- subject(s): Airplanes, Triangular Wings
All airplanes have at least two wings.
Dhanvada M. Rao has written: 'Subsonic investigations of vortex interaction control for enhanced high-alpha aerodynamics of a chine forebody/delta wing configuration' -- subject(s): Aerodynamics, Airplanes, Triangular Wings, Wings, Triangular
no
airplanes need wings so they can glide and land correctly
Birds and airplanes both have wings.
yes.
Yes, airplanes usually have 2 wings. 1 wing would be unsteady.
Wings.
2
The wings of an airplane are near-flat surfaces that plane the air.