Noun
alternate angles pl (plural only)
(geometry) the internal angles made by two (parallel) lines with a third, on opposite sides of it. If the parallels AB, CD, are cut by the line EF, intersecting at points G and H, then the angles AGH, GHD, are called alternate angles (as also are the angles BGH and GHC).
In her 1856 memoir Wau Bun, Juliette Kinzie described the fort as it appeared on her arrival in Chicago in 1831: The fort was inclosed sic by high pickets, with bastions at the alternate angles. Source: Internet
A short sequence was also added depicting Vader's return to his Super Star Destroyer after dueling with Luke, created from alternate angles of a scene from Return of the Jedi. Source: Internet