Congruent Obtuse Angles

This is an airplane. This relates to congruent obtuse angles because a plane has a lot of congruent angles. Plane wings have to be the same so the plane can be balanced. They can be found in the air and at airports. They are man-made, so they are manufactured in factories. Airplanes are used to transport people, cargo, missionary, animals, etc. This is apart of the Aerospace industry and planes is what Aerospace uses to study our environment.  http://www.macombcountymi.gov/mcped/E-Macomb/April%202009/Pictures/Aerospace%28wrklc2%29.jpg