If drawn on a flat plane (paper, for instance), then yes, they are a 2D shape.
plane shape
A circle is not a plane shape. A circle is round a plane is not. A plane has parts that are similar to a circle shape.
No, but an octagon is.
A sheet of A4 paper could be classed as a plane 2D shape, as it has length x width. A shoebox is an example of a 3D shape, as it has length x width x depth.
If drawn on a flat plane (paper, for instance), then yes, they are a 2D shape.
Both. ANY 2-dimensional shape ... that is, a shape drawn in a plane, or on a piece of paper ... has only one surface.
Long paper airplanes fly farther than short paper planes because they are more aerodynamic. This means they can move through the air more efficiently due to their long shape.
plane shape
it is a plane shape because you said its a square
The total distance around a plane geometric shape, i.e. one drawn on a piece of paper, is called the shape's perimeter.
A circle is not a plane shape. A circle is round a plane is not. A plane has parts that are similar to a circle shape.
A plane shape.
Paper
Depends on the paper used and how the paper plane was constructed.
Printer Paper make the best paper plane.
simply because its light and when you make a plane its sruface area keps it floatin and the shape of the plane controls the direction of the plane so you could even make a plane do the loop de loop