A 2D shape is flat and only has a surface area whereas a 3D shape is an object that has surface area and volume.
There can be no closed 3D shape with only one square and 3 triangles.
A pentagon is a 2D shape. Volume and Surface Area is only found in 3D shapes.
a face.
Only one; a triangle is a 2D shape, not a 3D shape. Usually only 3D (or more) shapes are considered to have 'faces'.
A 2D shape is flat and only has a surface area whereas a 3D shape is an object that has surface area and volume.
A sphere is a three-dimensional shape with one surface. Or: An irregular blob, an ellipsoid, a torus, plus other shapes. The most interesting 3D object with only one side is of course the Moebus strip.
That will depend on what they are but in general 3D shapes have surface area and volume whereas 2D shapes have only surface area.
cone
There can be no closed 3D shape with only one square and 3 triangles.
A pentagon is a 2D shape. Volume and Surface Area is only found in 3D shapes.
hemisphere
a face.
a sphere :)))
Only one; a triangle is a 2D shape, not a 3D shape. Usually only 3D (or more) shapes are considered to have 'faces'.
Klein Bottle: http://en.wikipedia.org/wiki/Klein_bottle Its circle
the face