圓_Collection

Reinhold Yen, Jul 20, 2016


  • 1. Tangents to a Circle
  • 2. Poncelet's Porism for 2 circles
  • 3. Pitot Theorem (Concave and Convex Quadrilaterals)
  • 4. Circle theorems
  • 5. Properties of Tangents
  • 6. Chords Equidistant from Circle's Center
  • 7. division of a segment
  • 8. the golden ratio
  • 9. square roots in a greek way...
  • 10. Tangents to Circles: Investigation
  • 11. 切割線性質
  • 12. MC Qn49
  • 13. Equilateral Action (4)!
  • 14. Quadrilateral Surprise!
  • 15. Not Your Everyday Chord & Tangent Theorem
  • 16. Proof Exercise: Inscribed Angle Theorem (Case 2)
  • 17. Proof Exercise: Inscribed Angle Theorem (Case 3)
  • 18. Geometric Mean Madness! (GoGeometry Action 84)
  • 19. GoGeometry Action 100!
  • 20. Tangents to Circle from External Point 由外點引切線

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Tangents to a Circle

– Michael Borcherds

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