The question is too vague to be answered in a sensible way. A five sided shape can have angles and sides of any measure that you like.
As a mental exercise, pick 5 people that you know in 5 different cities and connect their current location by straight lines (there is no need to follow the great circle). This will form a 5-sided shape. The lengths of those lines and the angles they form with one another will change as they go from home to work/school, go on holidays, whatever. All those measures will apply to a 5 sided shape.
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A pentagon is a 5 sided shape.
A 5 sided polygon is a pentagon
A five-sided 2-dimensional shape is a pentagon.
A 5 sided shape is called a pentagon.
Its a Pentagon.