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If it lies in a plane, it is a decagon.
Twenty edges
it is a decagon
A vertex is the same as an angle. A decagon has 10.A vertex is the same as an angle. A decagon has 10.A vertex is the same as an angle. A decagon has 10.A vertex is the same as an angle. A decagon has 10.
A decagon has ten sides - from the Greek word 'deka' meaning ten.