Folding an A4 Paper into an Equilateral Triangle 用A4紙摺出等邊三角形

This applet is copied from [url=https://www.geogebra.org/m/qKFGtBqg]chris cambré[/url] with slight modification.[br]More paper folding applets by chris cambré can be found [url=https://www.geogebra.org/m/NJ3EKuyb]here[/url].
gMath 互動數學教室 [url=http://www.geogebra.hk/]http://www.geogebra.hk[/url]
– Alex CHIK

Information: Folding an A4 Paper into an Equilateral Triangle 用A4紙摺出等邊三角形