Question

if a rectangle is rotated about the y-axis as shown below, what three-dimensional figure would be formed?
rectangular prism
cone
cylinder
square pyramid

Explanation:

When a rectangle is rotated around one of its adjacent axes (the y-axis here, which aligns with one side of the rectangle), the resulting 3D shape has a circular base and straight parallel sides, matching the definition of a cylinder. A rectangular prism is formed by translating a rectangle, not rotating it; a cone is formed by rotating a triangle; a square pyramid is formed by rotating a right triangle with a square base or folding a net, not a rectangle rotation.

Answer:

Cylinder