Angles & Parallel Lines
An angle measures turn or separation between rays, and intersections and parallel lines create dependable angle relationships.
What you'll learn
- Interpret an angle as turn between rays rather than ray length.
- Use full-turn and straight-angle benchmarks of 360° and 180°.
- Distinguish vertical angles from supplementary adjacent angles.
- Use corresponding and alternate interior angles only when parallelism is established.
- Chain angle relationships in triangles and bisected angles.
Before you start
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