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.

---

alternate angles British  

plural noun

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

---

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.

---

Etymology

Origin of alternate angles

First recorded in 1650–60

Example Sentences

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

From Golf Digest

As the perspective shifts to explore this assemblage from alternate angles, the man gets up to change out the memory card on one of the cameras, stores the completed card in a locker, then sits back down in his original spot.

From New York Times

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 Project Gutenberg

Euclid introduced the subject by the proposition that, if alternate angles are equal, the lines are parallel.

From Project Gutenberg

Those of the angles which lie between the given lines are called interior angles, and of these, again, any two which lie on opposite sides of the transversal but one at each of the two points are called “alternate angles.”

From Project Gutenberg