Frustum of a Pyramid
Frustum of a Cone
Figure 14-37.--Areas and volumes for calculating weights of castings--Continued.
triangles, or other polygons. A cylinder with parallel
In figure 14-38, several three-dimensional figures
ends would unroll into a parallelogram. A cone would
are shown. Try to form a mental picture of how these
unroll into a section of a circle. However, warped
figures would look if they were unfolded or unrolled
surfaces cannot lie flat. Double-curved surfaces present
and laid out in a flat plane. The polyhedrons, of course,
a similar problem.
would be merely a system of connected squares,