対たい頂ちょう角かく

noun

vertical angles; vertically opposite angles

Geometry term for the pair of opposite angles formed when two lines intersect. Used in mathematical contexts.

• 対たい頂ちょう角かくは常つねに等ひとしい。

  Vertical angles are always equal.

• この図ずで、角かくAと角かくBは対たい頂ちょう角かくです。

  In this diagram, angle A and angle B are vertical angles.