tablet selection

Arthur Lee

accessible in tablet devices


  • 1. Reflection in a Square
  • 2. circles
  • 3. Annulus
  • 4. Rectangle and a Square
  • 5. Difference of Two Squares 平方差 (2)
  • 6. Difference of Two Squares 平方差 (1)
  • 7. find two congruent triangles
  • 8. Sum of Squares & Perfect Square 平方和與完全平方
  • 9. Napoleon Tiling
  • 10. Compare Quadratic Graphs
  • 11. Quadratic and Linear Graphs
  • 12. 垂直線的斜率關係
  • 13. Constructing Quadrilaterals by Four Sides (2014)
  • 14. 方格紙上畫四邊形
  • 15. Trigonometric Ratios: Sine 三角比：正弦
  • 16. Solving Triangles (SSA case) 解任意三角形(SSA情況)
  • 17. Arc and Angle
  • 18. Spotlight
  • 19. exploring tangent-chord angle
  • 20. tangent chord angles
  • 21. distance-time / division by fractions
  • 22. Circumcircle of a triangle (Soft Construction)
  • 23. Locus 軌跡(6T)
  • 24. Locus 軌跡(4T)
  • 25. graphing an antiderivative function
  • 26. zoom tangent
  • 27. Interior & Exterior Angles of Triangles 三角形內角和及外角
  • 28. 多邊形的外角和
  • 29. Area of Circles
  • 30. Area of Circles 圓面積
  • 31. AQR Section 17: Dot Plot and Box-and-Whisker Plot
  • 32. a triangle ABC cut into 2
  • 33. another triangle ABC cut into 2
  • 34. Find 2 similar triangles
  • 35. Custom Tools
  • 36. Simple Tangram

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Reflection in a Square

Point E is reflected in the sides of the square. Drag E to see the change in the images.[br]What properties do you notice in the quadrilateral formed by the red points?[br]By dragging E to different positions, what kind of quadrilaterals can be made.
If we start with other shapes (instead of a square) for generating the mirror images, what different results will we have?[br]In what other ways would you extend this problem?
– Arthur Lee

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