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Its a circular shaped bottom that comes to a point at the top.
circle
cylinder
circumference
cone
There are many special figures in geometry and some of them are pyramid, cone, cylinder, sphere, circle, prism, polygon, polyhedron ..... etc
I am a geometric solid, I have two sufraces, One of my surfaces are rectangles, What Am I? Answer: Cone
You are a cone. You can see a picture of a cone and lots more information at http://en.wikipedia.org/wiki/Cone_(geometry)