vertical angles

American  

[vur-ti-kuhl ang-guhlz] / ˈvɜr tɪ kəl ˈæŋ gəlz /

plural noun

1. Geometry. Also called vertically opposite angles. a pair of angles directly opposite each other, sharing a vertex, and always of equal measure, formed by the intersection of two lines.

---

vertical angles British  

plural noun

1. Also called: vertically opposite angles.  geometry the pair of equal angles between a pair of intersecting lines; opposite angles

---

vertical angles Scientific  

/ vûr′tĭ-kəl /

1. Two angles formed by two intersecting lines and lying on opposite sides of the point of intersection.

---

Example Sentences

Measurement of geological features is done with a special compass that has a built-in clinometer, which is a device for measuring vertical angles.

From Textbooks • Jan. 1, 2015

If two lines intersect, the vertical angles are equal.

From The Teaching of Geometry by Smith, David Eugene

The uncertainties of terrestrial refraction render it impossible to determine accurately by vertical angles the heights of distant points.

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

He does not see why vertical angles should be proved equal when he knows that they are so by looking at the figure.

From The Teaching of Geometry by Smith, David Eugene

In this latter plan the introduction is usually made with the proposition concerning vertical angles, and the two simplest cases of congruent triangles.

From The Teaching of Geometry by Smith, David Eugene