DSE數學--定理(theorem)列表 Circle

DSE數學--定理(theorem)列表 Circle

Angle
  • ∠ at center twice ∠ at circumference
  • ∠s in the same segment
  • ∠ in semi-circle
  • Converse of ∠ in semi-circle
  • arc proportional to ∠ at center
  • arc proportional to ∠ at circumference
  • equal (angle/chord/arc), equal(angle/chord/arc)
  • ∠s in alt segment
Chord
  • perpendicular from center to chord bisect chord
  • line joining center to mid-pt of chord ⊥ chord
  • ⊥ bisector of chord bisect chord
  • equal chords, equidistant from center
  • chords equidistant from center are equal
Cyclic quadrilateral
  • opp ∠s, cyclic quad
  • ext ∠s, cyclic quad
  • opp ∠s supp.
  • ext ∠ = int. opp. 
  • converse of ∠s in the same segment
Tangent

  • tangent ⊥ radius
  • tangent properties
  • ∠s in alt segment
  • converse of  tangent ⊥ radius
  • converse of 
  • ∠s in alt segment

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