A cone.
A paraboloid.
a cone
The description given fits that of a cone.
The description given fits that of a cone.
"you" is not a number and so the question does not make sense.
It's a rectangle.
A cone.
cone
hemisphere
Yes, a cylinder has both curved and flat surface. Considering a solid cylinder standing on its end, the circular base and the circular top are flat surfaces. The surface connecting the top and bottom is curved.
cornet