A surface whose plane sections are all either ellipses or circles. A football approaches being an ellipsoid as does a discus.
Cylinder
2 objects are a race track and an egg. I know this because it was part of my science homework.
They are either kites or (if the diagonals bisect each other) rhombuses.
I think this is impossible the diagonals of a four sided figure will cross
A surface whose plane sections are all either ellipses or circles. A football approaches being an ellipsoid as does a discus.
cylinder
Any way you slice the earth, you get a chunk whose outline is a circle. (or approximately a circle if you look closely the mountains and valleys that the cross section cuts through disturb the circle). a mathematical sphere will give a mathematical circle at all cross sections.
They are circles whose radii are smaller than some value set by the user.
Each circle defines the boundaries of a set, all of whose members share a characteristic. All objects with the characteristic are inside the circle, all those without that characteristic are outside.
Cylinder
the objects whose density is more than that of fluid sink in the liquid
Usually, cylindrical coordinates refers to the transformation x = r cos(theta), y = r sin(theta), z = z, although x, y, and z can be permuted. Cylindrical coordinates (r, theta, z) are very useful for describing three-dimensional objects whose cross-sections are easy to express in polar coordinates. Circular cylinders are a good example.
The answer depends on the number whose fraction you are trying to find.
Quail, quarter, quill and quilt are objects. They begin with the letter q.
They are the objects whose measured speed as a function of time agrees well with theory.
A quadrant.