To determine the total number of degrees of any polygon, you can use the equation y=180x-360, where x is the number of sides.
In your case, it would be y = 180(21) - 360, which equals 3420 degrees.
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icosihenagon= 21-sided polygon icosihenagon= 21-sided polygon
The name of a 21 sided polygon is Icosihenagon.
An icosikaihena is a polygon with 21 sides
The name of a 21 sided polygon is Icosihenagon.
Icosikaihenagon