We can answer this question as follows:
If we rotate the triangle using the axis of rotation shown we will get:
1. A circle as the base for the rotating figure. The radius of the circle is the same length as the bottom side of the triangle.
2. We can see that the top part of this figure will be the apex of a cone.
3. The lateral area of the figure will be formed by the "hypotenuse" of the triangle.
Therefore, the figure will be a cone.
In summary, the fu