Bodies / surfaces

Let’s start with two pairs of concentric cylinders:

• horizontal

  • inner surface (which I name A_in);

  • outer surface (which I name A_out).

• vertical

  • inner surface (which I name B_in);

  • outer surface (which I name B_out).

Horizontal, inner body or surface:¶

Horizontal, outer body or surface:¶

Vertical, inner body or surface:¶

Vertical, outer body or surface:¶

Are these four bodies/surfaces all we need to construct the L-shape pipe?