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The sum of the interior angles of any regular polygon of n sides is equal to 180(n - 2) degrees.

3420 degrees

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Q: What is the sum of the interior angles of a 21 gon?
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Find the sum of the measures of the interior angles of a 21-gon?

it equals to 3420 degrees


Find the sum of exterior angles of a convex 21-gon?

The angles add up to 3420 degrees. In a regular 21-gon, each angle is about 162.86 degrees.


What is the sum of the interior angles of a 23-gon?

3,780 degrees Formula: 180(s-2) s=sides 180(23-2)=180*21=3,780


What is the sum of interior angle of a corvex 21-gon?

38 x 90 ie 3420o


the interior angle of a polygon with 21 sides?

So, the Sum of the interior angles for a 21 – sided polygon is equal to 3420°.


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

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


Find the sum of the measures of the exterior angles of a convex 21-gon?

The sum of exterior angles, of any polygon - convex or concave, and whatever the number of sides - is 360 degrees or 2*pi radians.


What is the sum of the interior angle measures of a 21-sided polygon?

The sum of the interior angles of a polygon is 2n - 4 right angles where n is the number of sides. When n = 21 then 2n - 4 = 42 - 4 = 38 right angles = 38 x 90 = 3420°. NOTE : If the polygon is a regular polygon then each interior angle measures 3420 ÷ 21 = 162.86°.


What type of polygon has the sum interior angles of 3420?

The sum of angles of a regular polygon: (n - 2)180 = 3,420 180n - 360 = 3,420 add 360 to both sides; 180n = 3,780 divide both sides by 180; n = 21 Thus a 21-side regular polygon has the sum of interior angles 3,420 degrees.


How many sides does a polygon have if the sum of the interior angles is 3420?

It will have: (3420+360)/180 = 21 sides


What is the Sum of interior and exterior angle at the vertex of a polygon?

The sum of the interior angles of a polygon with n sides is 180(n-2). Here is my explanation about it.http://math4allages.wordpress.com/2009/10/21/angle-sum/


What is the sum of the interior angles of a polygon with 21 sides?

(n-2)*180 degrees where n is the number of sides. In this case, n = 21 so 19*180 = 3420 degrees.