C
C
E
G F
B
B A
F E
A
Draw a surface by connecting A,B, and C. Draw you’re cone by connecting E,F, and G
A
G
A
Intersecting the cone and the suface will give you line A
Connect A,B,C and make a surface. Use line G and point E and F to make a cone.
Intersecting the previous cone and surface will give you line A
Network srf. the lines to get the minimal surface