GeoGebra

On-line Activities

Author:spkwan

Tim Brzezinski

Tim Brzezinski
https://www.geogebra.org/m/JKAusfRR

OrChiming

OrChiming
https://www. ggbm.at/KnfUCy7G

Pearson HK

https://www.ggbm.at/kqAh9Jft

NCTM illuminations

NCTM illuminations
https://www.nctm.org/Classroom-Resources/Illuminations/Interactives/Circle-Tool/ (Flash Player required)

OrChiming

OrChiming
https://www.ggbm.at/Z5dsTpDm

NOVA

NOVA
https://www.pbs.org/wgbh/nova/assets/swf/1/approximating-pi/approximating-pi.swf (Flash Player required)

保良局朱正賢小學

保良局朱正賢小學
http://www.hkedcity.net/edb/teachingresources/files/pmaths/circle/cir_webMAIN.html (Flash Player required)

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