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What is Icosikaihenagon?
the icosikaihenagon is a 21 sided polygon
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This is a 21 sided polygon and therefore has 21 angles. NOTE : The name supplied for this polygon is an artificial name and never used in practice. General usage refers to thi…s shape as a 21-gon.
The sum is 3420 as the equation for every regular polygon is (n-2)*180 when n is number of sides