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Angles in Polygons and Parallel Lines

Exam code: 05801/12
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FrontAngles in parallel lines

State the three parallel-line relationships.

BackAngles in parallel lines
  • Corresponding angles are equal, sitting in matching positions at the two crossings.
  • Alternate angles are equal, on opposite sides of the crossing line between the parallels.
  • Co-interior angles add to 180°, on the same side between them.

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