[list][*]Displays a [b]cone opening upward[/b] intersecting a [b]sphere centered at origin[/b].[br][/*][*]The intersection forms a [b]circular curve[/b].[br][/*][/list][br]Sliders:[br][list][*]φ= angle from z-axis (spherical)[/*][*]ρ= radial distance (spherical)[/*][/list]Point A lies on the cone surface, helping visualize spherical coordinates and surface intersection.

[u][color=#0000ff]https://www.geogebra.org/classic/twy2ramk[/color][/u]