In the mathematical right triangle ABC, AB=cAC=bBC=a angle ACB=90 degrees, and the other sides of the straight line where AB is located rotate once to form a geometric body surrounded by curved surfaces. ... It can be seen as the superposition of two cones.

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.