Which 2-dimensional shape can be rotated about the y-axis to create a cone?

2- dimensional shape can be rotated about the y-axis to create a cone is, right angle triangle

Step-by-step explanation:

A solid of revolution is a three-dimensional figure obtained by rotating a two-dimensional figure around a straight line that lies in the same plane.

It is a right angle triangle such that the height is greater than its base.

Now, rotating right triangle ABC about a vertical line y-axis.

As the triangle is revolved about the line i.e, y-axis, the vertices A and B remain stationary,

while vertex C follows the path of a circle.

so, the triangle rotates AB creates the outline of a cone.

therefore, 2- dimensional shape can be rotated about the y-axis to create a cone is, right angle triangle