Proofs Without Words

Alex CHIK, Nicola Trubridge, Jan 7, 2015


  • 1. Polygonal Number 多邊形數
  • 2. Centered Polygonal Number 中心多邊形數
  • 3. Triangular Number 三角形數
  • 4. Sum of First n Odd Numbers 首n個奇數之和
  • 5. Sum of First n Squares 首n個平方數之和
  • 6. Sum of First n Cubes 首n個立方數之和
  • 7. Sum of Squares & Perfect Square 平方和與完全平方
  • 8. Difference of Two Squares 平方差 (2)
  • 9. Difference of Two Squares 平方差 (1)
  • 10. Area of Trapezium
  • 11. Proof without words: Cosine Rule (餘弦公式)
  • 12. Interior & Exterior Angles of Triangles 三角形內角和及外角
  • 13. Two Squares
  • 14. Proof of Pythagoras Theorem(1) 畢氏定理的証明(1)
  • 15. Viviani's Theorem
  • 16. Feynman's Triangle
  • 17. Area of Circles 圓面積

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Polygonal Number 多邊形數

GeoGebra 互動數學教室 [url=http://www.geogebra.hk/]http://www.geogebra.hk[/url]
– Alex CHIK

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