We will be calculating the volume of both right and oblique figures.
The axis of a 3-D figure is the segment connecting the center of the bases in cylindric solids (cylinders and prisms) or connecting the vertex and the center of the base in conic solids (cones and pyramids).
Unlike oblique figures, the axis of right figures is perpendicular to the base.
The altitude (height) is the distance between the bases in cylindric solids or the distance betwen the vertex and the base in conic solids.