A cone is a distinctive three- dimensional geometric figure that has a flat surface and a curved surface. The end of the cone is called the Apex : whereas the flat surface is called the base.[br]In a cone, there is one circular face .[br] Zero edges and one vertex.

Applet of Net of Cone.

-If you move slider h then there becomes the changes in height of cone .[br]- there is two surfaces in a cone the blue surface is called curved surface and Red surface is flat surface.[br]- If you move slider [math]\alpha[/math] then there becomes a net of cone.[br]

1. Open a new GeoGebra window.[br]2. Open 3D-graphics perspective .[br]3. Input A=(0,0,0)[br]4. Make a number slider a with min --5 and max-5 [br]5.Create a point P(a,0,0) and C(0,0,a).[br]6.jJoin the point P and C.[br]7. make a angle slider [math]\alpha[/math] with min-0[math]^\circ[/math] and max-360[math]^\circ[/math].[br]8.Input Surface (f,[math]\alpha[/math],Z axis ) from the input bar.[br]9. Also draw a circle through point A to Z Axis .[br]10. Hide all unnecessary object from the applet and write text Net Of cone from the text tool.[br]11. Decorate/Enhance your construction from the object properties.