Every possible cross section of a three-dimensional figure is a circle. What is the figure?

cone

cylinder

circle

sphere

It's a sphere, Adam.

Look at it this way; no matter where you cut through an orange, you will always be looking at a circle.

It would have to be a sphere. Anywhere you cut a sphere into a cross section it creates a circle.

Cone doesn't work because it will create a triangle if cut from the peak to the base.

Circle is 2 dimensional so it can't be sliced in this fashion.

Cylinder creates a rectangle when cut vertically.