Private walks typically 3 ft wide. Public walks, 4 ft wide but vary by municipality and handicap accessibility.
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Like you would a regular prism.
I assume it is the space (in 3 dimensions) that something occupies
Mostly true - you cannot tessellate only regular pentagons in two dimensions, since you cannot sum up the intersection of the angles to 360 degrees. If you tessellate a regular pentagon in three dimensions, you end up with a dodecahedron.
This question cannot be answered sensibly. A square foot is a measure of area, with dimensions [L2]. A [regular] foot is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
A pentagon is a plane figure and has only two dimensions. It cannot have three dimensions.