[size=85] Note: [br]1.This is an Improved [url=https://www.geogebra.org/m/d9ytv4wg]version[/url]. Theoretical explanations can be found in the [url=https://www.geogebra.org/m/stfexhyj]Applet[/url].[br]2.This applet might not work properly in the online worksheet, but it works well in a ggb file. [/size]