A sphere
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a circle in 3D would acually be called a SPHERE
Semi-circle. (2D) Hemi-sphere (3D)
Because a circle is a two-dimensional figure - the other two are three-dimensional. The circle is just a flat thing that is just drawn while both a cone and cylinder are 3D. The cone has a flat circle on the buttom and the rest is a triangle the is circlier, As shown: As A cyliner has to cirles , on the top and botom and the rest is a big 3d of it, as shown: While the circle is flat at of all of them, as shown:
2D = semi circle 3D = hemisphere
here are some: 2d shapes- square circle triangle Rectangle 3d shapes- cone cuboid cube prism