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Answer: Cone with radius 3 units

Step-by-step explanation:

The solid 3D (three-dimensional) object which is produced by rotating the square about the line is a cylinder.

What is the rotation of plane?

Rotation of a plane or revolution of a plane is the method to obtain a solid 3D figure by revolving the plane around a fixed point.

Revolution of a square plane about line-

  • A square plane is in the shape of quadrilateral, which has 4 equal side and equal angle.
  • When the square rotates about a line (vertical or horizontal), it creates the figure similar to its shape around the circular path.
  • This rotation provides the cylinder solid.

Thus, the solid 3D (three-dimensional) object which is produced by rotating the square about the line is a cylinder.

Learn more about the solids of rotation here;

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