10 sides 10 corners (vertices), no intersecting lines a closed figure.
The sides&angles are not necessarily equal, unless a regular polygon is specified. A five-pointed staractually is a 10-sided polygon (There are 5 vertices pointing 'out' and 5 pointing 'in').
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A 10 sided polygon is a decagon
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A 10-sided polygon is a decagon. A 12-sided polygon is a dodecagon.
A 10 sided polygon is a decagon
A 10 sided polygon is a decagon