In our real world, the space is 3D. It is currently unknown whether it is infinitely large.
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A 2d shape is a flat object (ex: square, circle, etc.) and a 3d shape is a shape in space (ex: cube, sphere, etc.)
There are infinitely many of them.There are infinitely many of them.There are infinitely many of them.There are infinitely many of them.
A vector can be resolved into infinitely many sets of components in both 2D and 3D space.
There are infinitely many shapes and not all of them have names.
There are infinitely many 2d shapes. They can have 1 side (a circle or ellipse) to infinitely many. They can have sides that are straight or not, the sides can be equal or unequal in length, the angles can be equal or unequal, etc.