This is the transcript for the video of same title. Video contents: The ancient port city of Corinth in Greece allows us to explore the evolution of sailing. The shapes of sails went from rectangular to triangular. The use of right-triangle-shaped sails changed the nature of sailing. Becoming less reliant on oarsmen and being able to sail under nearly any wind conditions, the sailboat made the conquest of the seas possible. We explore the properties of right triangles that make such sails ideal.

A full video is available here: https://media4math.com/library/geometry-applications-triangles-segment-3-right-triangles

A Promethean Flipchart is available for this video: https://www.media4math.com/library/promethean-flipchart-geometry-applications-right-triangles