HTML5 Collection for Tablets

GeoGebra Institute of Hong Kong

This is a collection of applets in the depository of GeoGebra Institute of Hong Kong ([url]https://sites.google.com/site/hkgeogebra/[/url]) which could be properly accessed using tablet devices.


  • 1. Area of Circles
  • 2. Exterior Angles of Polygons
  • 3. Rolling Coin 滾動的硬幣
  • 4. Measuring Angles Using Protractor
  • 5. Fraction Division1:　a ÷ b (Partitive)
  • 6. Constructing Quadrilaterals by Four Sides (2014)
  • 7. Telling time from clocks
  • 8. Chinese Match Puzzles 2 (7 puzzles)
  • 9. Classifying Quadrilaterals
  • 10. Discovering Pythagoras' Theorem by Area
  • 11. Drawing quadrilaterals on the grid or the pinboard
  • 12. Cut Triangles into Rectangles & Dudeney's Puzzle Generalized
  • 13. Unit Circle and Sine Graph
  • 14. Rolling Regular Polygon 滾動的正多邊形
  • 15. Find the Elapsed Time using 'Hours & Minutes'
  • 16. Variety of Perimeters with Fixed Area
  • 17. Variety of Areas with Fixed Perimeter
  • 18. Area of Parallelograms
  • 19. Fraction Multiplication
  • 20. Fraction Division4:　1 ÷ a/b (Quotitive)
  • 21. Percentages: Selling Problems, Profit & Loss
  • 22. Circumcircle of a triangle (Soft Construction)
  • 23. Incircle of a triangle
  • 24. Introduction to Sine
  • 25. Introduction to Cosine & Tangent
  • 26. Solving Triangles (SSA case) 解任意三角形(SSA情況)
  • 27. Difference of Two Squares 平方差 (1)
  • 28. Triangular Number 三角形數
  • 29. zoom tangent
  • 30. Matrix and Linear Transformation
  • 31. Defining Trigonometric Ratios
  • 32. Circumference of Circles
  • 33. Quiz on Slope (3) | 斜率測驗(3)
  • 34. Slopes of Perpendicular Lines
  • 35. Equation of Straight Lines 直線的方程
  • 36. Congruent Triangles 1
  • 37. Diagonal Problem (Manual Counting)
  • 38. Sierpinski Triangle
  • 39. Koch Snowflake 2

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Area of Circles

What is the area of a circle? Explore with the following applet.
Anthony Or, GeoGebra Institute of Hong Kong.
– Anthony OR 柯志明

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