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sum_of_interior_angles = (number_of_sides - 2) x 180°
→ if number_of_sides is 21: sum = (21 - 2) x 180° = 19 x 180° = 3420°
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∙ 9y ago
Jose Vasquez
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What is the sum of the interior angles of a 21 gon?
The sum of the interior angles of any regular polygon of n sides is equal to 180(n - 2) degrees. 3420 degrees
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.
If a regular polygon has exterior angles that measures approximately 17.14 degrees how many sides does it have?
No matter how many sides it has, the exterior angles of a regular polygon add up to 360 degrees. So 360/17.14 = 21 sides.
What is the name of a polygon that has 3420 degrees in it?
It will have 21 sides or a 21-gon
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 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.
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 a 21 sided polygon?
The name of a 21 sided polygon is Icosihenagon.
What is the sum of the interior angles of a 21 sided polygon?
180*(21-2) = 180*19 = 3420 degrees.
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 do you call a 21-sided polygon?
icosihenagon= 21-sided polygon icosihenagon= 21-sided polygon
How many angles does icosikaihenagon have?
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 this shape as a 21-gon.
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.
What is a 21 sided polygon called?
21 sided polygon: icosikaihenagon or henicosagon
What is the size of each angle of a regular polygon with 23 sides?
The sum of the angles of a polygon is equal to 180° times (n-2) where n is the number of sides.For a 23-sided polygon, that would give a total of (180°) x (21) = 3780°. If the angles are all the same, each would be 3780° ÷ 23 = 164.3478°
21 sided polygon?
An icosikaihena is a polygon with 21 sides
Twenty one sided polygon?
The name of a 21 sided polygon is Icosihenagon.
