Definition of Alternate angles
1. Noun. (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). ¹
¹ Source: wiktionary.com
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