This applet is modified from an applet by [url=https://www.geogebra.org/u/orchiming]Anthony Or[/url].[br]Chinese version: [url=https://www.geogebra.org/material/show/id/wv3ytdqf]https://www.geogebra.org/material/show/id/wv3ytdqf[/url][br]English version: [url=https://www.geogebra.org/material/show/id/sZN7kF7J]https://www.geogebra.org/material/show/id/sZN7kF7J[/url]

gMath 互動數學教室[br][url=http://www.gmath.hk/]http://www.gmath.hk[/url]