alternate angles

American  

plural noun

Geometry.

1. two nonadjacent angles made by the crossing of two lines by a third line, both angles being either interior or exterior, and being on opposite sides of the third line.

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alternate angles British  

plural noun

1. two angles at opposite ends and on opposite sides of a transversal cutting two lines

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alternate angles Scientific  

1. Two angles formed on opposite sides of a line that crosses two other lines. The angles are both exterior or both interior, but not adjacent.

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Etymology

Origin of alternate angles

First recorded in 1650–60

Example Sentences

Two cameramen crouch in front, capturing him from alternate angles — one locked on his made-for-TV visage and the other set to pan across his body once he starts delivering his lines.

From Los Angeles Times • Aug. 28, 2022

DW: You could see in some of those alternate angles how clear of an angle Crowder had to see the rim.

From Los Angeles Times • Jun. 24, 2021

Six holes play right on the shoreline, and every hole offer genuine alternate angles of attack.

From Golf Digest • Jan. 11, 2018

And “if the lines are parallel, are alternate angles necessarily equal?”

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various

It the parallels AB, CD, are cut by the line EF, the angles AGH, GHD, as also the angles BGH and GHC, are called alternate angles.

From Webster's Unabridged Dictionary by Webster, Noah