Question

which description best describes the three-dimensional object that is formed when the shape is rotated about the axis as shown?
a flat disk with a hole in the center
a square pyramid
a hollow cylinder
a rectangular prism that is open on the ends
(image shows a rectangle and an axis with a rotation arrow)

Explanation:

When a rectangle is rotated about an axis parallel to one of its sides (but not coinciding with it), the resulting three - dimensional object is a hollow cylinder. A flat disk with a hole (a washer) would be formed if a rectangle was rotated about an axis perpendicular to its plane. A square pyramid is formed by rotating a right - triangle. A rectangular prism is a 3D object with no rotation involved in its basic formation from a rectangle (it's just extrusion in 3D space, not rotation).

Answer:

a hollow cylinder