Curved Surface Area of a Cone 圓錐的曲面面積

Modified from [url=http://tube.geogebra.org/material/show/id/359169]https://www.geogebra.org/material/show/id/P8NBphTJ[/url] by [url=http://www.geogebra.org/orchiming]Anthony Or[/url].
GeoGebra 互動數學教室 [url]http://www.geogebra.hk[/url]
– Alex CHIK, Anthony OR 柯志明

Information: Curved Surface Area of a Cone 圓錐的曲面面積