Distance from c to AB d=ab/c
Geometric volume v =1/3pi * D2 * c =1/3pi * a2 * B2/c.
After the side is unfolded, the corresponding central angles are θ 1=2pi*d/b and θ2=2pi*d/a respectively.
Geometric surface area s =1/2b2 * θ1+1/2a2 * θ 2 = pi * ab (a+b)/c.