[b][color=#b20ea8]A collection of construction problems with rulers and compasses
尺規作圖問題集[/color][/b]
The majority of problems are adopted from the iPad app GeoGon ([url]http://iappideas.com/geocon[/url]).
[b]GeoGebra 互動數學教室[/b]
[url]http://www.geogebra.hk[/url]
