# Chapter 1 - Tools of Geometry - 1-5 Exploring Angle Pairs - Practice and Problem-Solving Exercises - Page 38: 15

$\angle$AOB and $\angle$DOC

#### Work Step by Step

A pair of vertical angles are opposite angles made by two intersecting lines. $\angle$AOB and $\angle$DOC are opposite angles made by the intersection of $\overline{AC}$ and $\overline{DB}$.

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