[list=1][*]Click the coordinates or the equations to change them to fractions or decimals. [/*][*]Click the straight line to show/ hide the red control points. [/*][*]Click the red control points to show/ hide their coordinates. [/*][/list]

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