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).
In 1946 the Skywriting Corporation found themselves with a fleet of surplus World War II planes and developed dot matrix skywriting, or skytyping. Skytyping is the process of using five planes in formation to choreograph puffs of smoke being released from each plane. The messages, written at 10,000 foot altitude, can be up to 1250 feet tall and over five miles long.