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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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Related Questions

What do you call a 21-sided polygon?

icosihenagon= 21-sided polygon icosihenagon= 21-sided polygon


What is the sum of the exterior angles of a 21 sided polygon?

The sum of the exterior angles of any polygon, regardless of the number of sides, is always 360 degrees. Therefore, the sum of the exterior angles of a 21-sided polygon is 360 degrees.


What is the sum of a 21 sided polygon?

The name of a 21 sided polygon is Icosihenagon.


What are the names to polygons from 21 to 30 sides?

The names of polygons with sides ranging from 21 to 30 are as follows: a 21-sided polygon is called a icosagon, a 22-sided polygon is a dicosagon, a 23-sided polygon is a tricosagon, a 24-sided polygon is a tetracosagon, a 25-sided polygon is a pentacosagon, a 26-sided polygon is a hexacosagon, a 27-sided polygon is a heptacosagon, a 28-sided polygon is an octacosagon, a 29-sided polygon is a nonacosagon, and a 30-sided polygon is a triacontagon.


What is the sum of the interior angles of a 21 sided polygon?

180*(21-2) = 180*19 = 3420 degrees.


21 sided polygon?

An icosikaihena is a polygon with 21 sides


Twenty one sided polygon?

The name of a 21 sided polygon is Icosihenagon.


How many triangles are formed by the diagonals in a 21 sided polygon?

The number of triangles formed by the diagonals of a 21 sided polygon is C(21,3) = 21x20x19/3x2x1 = 1,330.


What is a 21-sided polygon?

Icosagon


What is 21 sided polygon called?

Icosikaihenagon


How many diagonals can you draw fron one vertext of a 23 sided polygon?

21


What would you call a 21 sided polygon?

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