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).
The Royal Flying Doctor Service of Australia (RFDS, informally known as The Flying Doctor) is one of the largest and most comprehensive aeromedical organisations in the world.