In geometry, the only shape that has one surface is a plane.
Both. ANY 2-dimensional shape ... that is, a shape drawn in a plane, or on a piece of paper ... has only one surface.
a cone.
A sphere
A cone.
A cylinder. Technically, the curved surface of a cylinder is not called a face, only the flat surfaces, so a cylinder has 2 faces and one curved surface.
There is no cure for AIDS, there has been only one person cured of HIV who was cured through intensive stem-cell treatment.
No. I must admit, that after you have been cured, your chances for taking over the world are poor. You can only hope to kill the one's that havent been cured
Circle
half a sphere
It's called a mobius strip.
It is a hemisphere