triangle and circle
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A rectangle and two circles
A cone with included interior is 3-dimensional. However, if you are not including the interior it is a 2-dimensional surface residing in a 3-d ambient space. If you're utilizing the common topological definition of dimension, you can derive that a cone (surface only) is 2 dimensional by looking at its open sets.
Polygons are a special type of 2-dimensional shapes.
No. A polygon is a plane figure - i.e. it is 2-dimensional A cone is a solid figure - i.e it is 3-dimensional
2 dimensional shapes