Figure 1(b)
The cone can be generated by revolving the line 
(the red uppermost arrow in figure 1(b)) about the x‑axis. Each cross section (perpendicular to the x‑axis) is a disk; thus the volume is given by,
Solving this integral gives,
(You may want to maximize your window to see the solution more clearly.)
Figure 1(b) |
The cone can be generated by revolving the line
Solving this integral gives,
|