Angle rules, interior and exterior angles of polygons, and the full set of circle theorems with how to apply them.
Angle rules
- Angles on a straight line sum to 180°; around a point, 360°.
- Vertically opposite angles are equal.
- With parallel lines: corresponding angles equal (F), alternate angles equal (Z), co-interior angles sum to 180° (C).
- Angles in a triangle sum to 180°; in a quadrilateral, 360°.
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