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 (RFDS) is one of the world's most remarkable medical organisations. Developed by the Rev. John Flynn, it's an Australian invention that gives to people living in the isolation of the vast and remote outback--an angel of mercy. BLANCH: This year the RFDS celebrates 75 years of service.