A cone is formed by revolving which of the following figures about a line containing one of its edges?
A. Rectangle
B. Right Triangle
C. Semicircle
D. Hexagon
I am reluctant to tell you the answer because this is an easy question to figure out, if you visualize the situation.
See figure 4(b) of his website for a picture of what they are talking about.
http://larouchepub.com/eiw/public/2005/2005_50-52/2005-51/pdf/box2_49.pdf
That should help you choose the right answer.
Okay, this confirmed what I thought it was. Thanks
To determine which figure forms a cone when revolved about a line containing one of its edges, we need to consider the shape that is created when the figure rotates.
A. When a rectangle is revolved about a line containing one of its edges, it forms a cylinder, not a cone. Therefore, option A is incorrect.
B. When a right triangle is revolved about a line containing one of its edges, it forms a cone. The line of rotation acts as the axis of the resulting cone. Therefore, option B is correct.
C. When a semicircle is revolved about a line containing one of its edges, it forms a sphere, not a cone. Therefore, option C is incorrect.
D. When a hexagon is revolved about a line containing one of its edges, it forms a cylinder, not a cone. Therefore, option D is incorrect.
In conclusion, the correct answer is B. A cone is formed by revolving a right triangle about a line containing one of its edges.