Each of the pairs of opposite angles made by two intersecting lines.
- However, they had not been exposed in class to the notion of vertical angles or to the vertical angles theorem.
- In Israel, students usually prove the equality of vertical angles by the end of Grade 8 or at the beginning of Grade 9.
- Rose uses Nexo's proprietary line array-design software, GeoSoft, to calculate vertical angles for even coverage throughout the venue.
Definition of vertical angles in:
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