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

This applet is copied from chris cambré with slight modification. More paper folding applets by chris cambré can be found here.
gMath 互動數學教室 http://www.geogebra.hk
– Alex CHIK

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