Question

which of the following is the best description of the resulting three-dimensional figure if a right triangle is rotated about a line containing its hypotenuse ​

Answer 1

The best description of the three dimensional figure is two right conical figure one sitting on the other.

for short a double conical figure

Explanation:

when a right angle triangle is rotated about it hypotenuse, a double conical shape is formed, one sitting on the other.

kindly find attached a rough sketch of the right angled triangle and the revolved figure for your reference.