Surface area of a spherical sector (cone)
$$S = \pi\cdot R\cdot (2\cdot h+r)$$
S - surface area
R - radius of a sphere
h - height of a spherical cap belonging to spherical sector
r - radius of a base of a spherical cap belonging to spherical sector
R - radius of a sphere
h - height of a spherical cap belonging to spherical sector
r - radius of a base of a spherical cap belonging to spherical sector
Find
It is known that:
= 