Question

Each 2 dimensional figure on the left is rotated about the axis shown. Choose the solids of rotation that results from each on the right.

Answer 1

For Option A, imagine the rectangle doing a full turn or full rotation in the given axis. After rotation, the solid formed will be a cylinder. Hence, Option A pairs with Option 3.

For Option B, imagine the half-circle doing a full rotation on y-axis. The solid formed will be sphere. Hence, Option B pairs with Option 4.

For Option C, imagine the right triangle doing a full rotation on the y-axis. The solid formed will be a cone. Hence, Option C pairs with Option 2.

And lastly, Option D pairs with Option 1.

To summarize, we have:

A - Option 3

B - Option 4

C - Option 2

D - Option 1