True...
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False
False...
Yes.
In geometry three-dimensional shapes are solid figures or objects or shapes that have three dimensions length, width, and height. Unlike two-dimensional shapes, three-dimensional shapes have thickness or depth. A cube and cuboid are examples of three-dimensional objects, as they have length, width, and height.
Yes. Every solid will have all three of those "dimensions". They may not be easy to measure, but they're there.