0
(n-2)*180
3420 degrees
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∙ 14y ago
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What is a 21 sided shape called?
a decadogon
What is 21 sided shape called?
Icosihenagon
What is the measure of each interior angle of a regular 21-gon?
Each interior angle measures 162.'857142' degrees recurring '857142'
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.
The measure of the second angle of a triangle is 21 degrees more then the measure of the first angle the measure of the third angle is 15 degrees less than the measure of the first angle. each is?
Let the measure of the first angle be x⁰. So that the second angle would be (x + 21)⁰, and the third one would be (x - 15)⁰.Since the sum of angle measures in a triangle is 180⁰ we have:x + x + 21 + x - 15 = 1803x = 174x = 58Thus, the first angle is 58⁰, the second angle is 79⁰, and the third angle is 43⁰.
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 shape has 8820 as it's interior angle?
21
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 is a 21 sided shape called?
a decadogon
What is 21 sided shape called?
Icosihenagon
What is the name of a 21 sided shape?
Icosihenagon
What is a 21-sided shape called?
Dodectagon
What is each interior angle of a regular polygon with 21 sides?
Each exterior angle is 360/21 = 17.1429 deg so each interior angle is 180 - exterior angle = 162.8571 degrees.
What is the measure of each interior angle of a regular 21-gon?
Each interior angle measures 162.'857142' degrees recurring '857142'
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 interior angle of a corvex 21-gon?
38 x 90 ie 3420o
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/
