Circles (Theorems)

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• Circle Vocabulary

  • Circle Terminology

• Tangents

  • Properties of Tangents (B)

• Inscribed Angle Theorems & Corollaries

  • Inscribed Angle Theorem (V1)
  • Inscribed Angle Theorem: Take 2!
  • Where to Sit? (I)
  • Inscribed Angle Intercepts Semicircle
  • Cyclic Quadrilaterals (IAT: Corollary 3)

• Theorems Involving Chords

  • Congruent Chords: Quick Investigation
  • Diameters & Chords I (VB)
  • Angle Formed by 2 Chords (II)
  • Angle Formed by Chord & Tangent (I)
  • Angle Formed by Chord & Tangent (II)
  • Congruent Chords Action (A)
  • Equidistant Chord Action
  • Crossing Chords: Proof Hint

• Secant & Tangent Theorems

  • Angles from Secants and Tangents (V1)
  • Angle From 2 Secants (V2)
  • Secants: Proof Hint

• Older (Earlier) Applets

  • Inscribed Angle Theorem (Proof without Words)
  • Inscribed Angle Theorem (Corollary 1) (Proof without Words)
  • Inscribed Angle Theorem (Corollary 2) (Proof without Words)
  • Inscribed Angle Theorem (Corollary 3) Cyclic Quadrilaterals
  • Angle formed by a Secant & Tangent: What Do You See? (V1)
  • Angle Formed by a Secant & Tangent: What Do You See? (V2)
  • Angle Formed by 2 Tangents (V2): What Do You See?
  • Cyclic Quadrilaterals
  • Congruent Chords in the Same Circle
  • Inscribed Angle Theorem (Intro): What Do You See Here?
  • Inscribed Angle Action !!!
  • Inscribed Angle Action! (2 Theorems)
  • Angle Formed by 2 Chords (V1): What Do You See?
  • Angle Formed by 2 Chords (V2): What Do You See?
  • Chords Equidistant from Circle's Center
  • Crossing Chords Property & Proof Start
  • Crossing Chords Property & Proof Start (II)