one dimensional line that curves into 2 dimensions
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Circle is the odd-one-out - all the other shapes are 3-dimensional, while a circle is a 2-dimensional figure.
A circle is by definition 2-dimensional (flat). If you mean a circle that is wider in one direction than the other, than you are thinking of an ellipse.
A semicircle is a two-dimensional (2D) shape. It is a closed curve that divides a circle into two equal parts, with one straight edge and one curved edge. In contrast, three-dimensional (3D) shapes have depth, width, and height, such as cubes, spheres, and pyramids.
2 dimensional shapes
triangle and circle