Show that the semi Vertical angle of the right circular cone of given total surface area and maximum volume is sin-¹ 1/√3 (i.e sin inverse 1 by √3).
Show that the semi-vertical angle of the cone of the maximum volume and of given slant height is tan−1√2.
Show that the semi-vertical angle of the right circular cone of given surface area and maximum volume is sin−1(13)