Corresponding sides are a pair of matching sides in two different shapes (size does not matter). In the field of geometry, the concept of corresponding sides plays an important role to prove various triangular theorems.
The Boeing B-17 Flying Fortress is a four-engine heavy bomber aircraft developed in the 1930s for the United States Army Air Corps (USAAC).
Trans World Airlines Boeing B-17 Flying Fortress. 1  Following the war, Trans World Airlines purchased a surplus B-17G and used it to survey and set up routes in the Middle-East. In 1947, it was given to the Shah of Iran. 2  Aero Union - began operation of the B-17 as a fire fighting aircraft in 1961.