Thread: Hexagonal Spherical Pyramid

Can anyone please help me with this problem. I don't even have an idea how a hexagonal spherical pyramid looks like.

Find the volume of a hexagonal spherical pyramid whose base angles are 135°, 105°, 122°, 110°, 131°, and 142° on a sphere of radius 20in.

Can anyone please help me. All I can solve for is the spherical excess E.

E=Total angle-Total internal angle of a hexagon
=(135+105+122+110+131+142)-180*(n-2)
=745-720
E=25