This is an image of a fighter plane that contains two congruent obtuse angles on top of each wing (drawn in red). The wings hit the body of the body of the plane at an angle that is greater than 90°, but less than 180° for aerodynamic purposes. This creates two congruent obtuse angles. Fighter planes like this are used in the US military, along with international militaries. They are designed to be fast and equipped with weapons to make them efficient air fighting machines. These planes are flown by only the most equipped pilots along side their naviagator.
I found this image online at http://www.mi9.com/fighter-plane_19450.html
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