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Ruler
Author:
Anthony OR 柯志明
Drag the ruler to move. Drag the red point to rotate. Use the slider to adjust the length.
GeoGebra
Anthony Or GeoGebra Institute of Hong Kong
New Resources
Roll 6d five times
Morse code visualizer / decoder
International Day of Mathematics 2025
Flip 9 Coins
Basic Percent Exercises (V2)
Discover Resources
PacMaze
Charged Particles in a Magnetic Field
Trig Limits
Q3 Assignment 2
Discover Topics
Coordinates
Arithmetic Operations
Addition
Perimeter
Special Points