Ring of Circular Cross Section
Segment of a Sphere
Sector of a Sphere
Figure 14-37.--Areas and volumes for calculating weights of castings--Continued.
The surface itself may be plane or flat. It could be
plane-curved surface can be unrolled and laid out flat.
plane-curved, such as the peripheral surface of a
This is called developing the surface, A warped surface
cylinder; warped, like the surface of a screw thread; or
or double-curved surface can only be developed
double-curved, like the surface of a sphere. A