**Vertical Angles and Parallel Lines Crossed by a Transversal** is the fourth of eight self-paced lessons in the “Lines, Angles, and Triangles” section of KET’s GED^{®} Geometry Professional Development Online Course. **Vertical Angles and Parallel Lines Crossed by a Transversal** establishes the basis for understanding the relationship between vertical and congruent angles when depicted in line drawings.

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