For it to be three dimensional, it would be a sphere.
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yes Correction: No. It is a 2-dimensional, or plane, shape.
triangle circle square octagon pentagon hexagon trapezoid
A semi-circle is a two dimensional shape.
a Sphere.
If you draw a circle (or something approximating a circle)on a surface, it will be two-dimensional. The two dimensions will be theheight and width of the circle.In essence, however, a circle is just an abstract concept. In that sense, it does not actually have any dimensions.