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

2 answers

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