The term that best describes it is an "oxymoron". A solid shape with one base opposite a single point is not a prism so such an object cannot exist.
vertex
===> "circle", with center at the "single point" and radius of the "certain distance".
The answer will depend on what the "certain distances" are for each point.
Circle
Altitude
vertex
===> "circle", with center at the "single point" and radius of the "certain distance".
Locus
The major axis is the longest possible segment you can draw from one point on the ellipse ,through the center, and to the opposite point.
The answer will depend on what the "certain distances" are for each point.
Circle
Circle
The answer will depend on what the "certain distances" are for each point.
Altitude
the magnifying glass must be positioned so as to focus the light from the sun on a single point (ex. kindling), causing heat and hopefully, a small fire
point on page 264
altitude