Y9 Geometry Rules

Anton Coltham, 2015 8-р сар 22

Geometry Rules for Y9 (NZ)


  • 1. Rule 1: Adjacent angles on a straight line
  • 2. Rule 2: Angles around a point
  • 3. Rule 3: Vertically Opposite Angles
  • 4. Rule 4: Angles in a triangle
  • 5. Rule 5: Base angles of isosceles triangle
  • 6. Rule 6: Angles of an equilateral triangle
  • 7. Rule 7 : Angles in a quadrilateral
  • 8. Rule 8: Corresponding Angles on parallel lines
  • 9. Rule 9: Alternate Angles on parallel lines
  • 10. Rule 10 : Co-interior angles on parallel lines

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Rule 1: Adjacent angles on a straight line

Rule 1: Adjacent angles on a straight line
– Anton Coltham

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