semi circle
You are probably thinking of the Moebius strip.
A cone !
No, it is a 3-d shape. A circle is a 2-d shape.
A cylinder perhaps
semi circle
You are probably thinking of the Moebius strip.
Cylinder
A cylinder.
A cone !
No, it is a 3-d shape. A circle is a 2-d shape.
They are straight lines where two plane faces of the shape meet. The definition is sometimes extended to curved lines where curved (3d) faces meet such as at the base of a cone.
A 2-d shape is a two dimensional shape meaning it is flat.
A cylinder perhaps
Draw any 2D shape on a piece of paper. Cut it out. Now try to fold it in half. Cna it fold perfectly in half? or is there a bit of paper sticking over the edge? If there is a bit of paper sticking over the edge, the shape is not symmetrical
A 2-d shape. The suffix -gon indicates a 2-d shape while -hedron indicates a 3-d shape.
a cylinder