a sphere
Circle
A hemisphere
hemisphere
That shape would be a trapezoid.
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 sphere
It is due to surface tension. Surface tension is only for liquids. Due to surface tension surface energy is to be minimized only reducing the area. For a given volume sphere has minimum surface area. Hence spherical shape.
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.
Circle
half a sphere
It's called a mobius strip.
It is a hemisphere
A pentagon is a 2D shape. Volume and Surface Area is only found in 3D shapes.