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An 18-gon, also known as an octadecagon, has 18 sides. To find the number of triangles in an n-gon, you can use the formula (n-2)C3, where C represents a combination. Plugging in n=18, we get (18-2)C3 = 16C3 = 16! / (3!(16-3)!) = 16! / (3! * 13!) = 161514 / 321 = 560. Therefore, an 18-gon has 560 triangles.
What else can I help you with?
How man triangles are in a 18-gon?
To find the number of triangles that can be formed in an 18-gon, you can use the formula for combinations: ( C(n, k) ), where ( n ) is the number of vertices and ( k ) is the number of vertices needed to form a triangle (which is 3). For an 18-gon, this is calculated as ( C(18, 3) = \frac{18!}{3!(18-3)!} = \frac{18 \times 17 \times 16}{3 \times 2 \times 1} = 816 ). Therefore, there are 816 triangles that can be formed from the vertices of an 18-gon.
How many sides on an 18-gon?
There are 18 sides
How many diagonals does a n 18-gon have?
To find the number of diagonals in an 18-gon, you can use the formula ( D = \frac{n(n-3)}{2} ), where ( n ) is the number of sides. For an 18-gon, this gives ( D = \frac{18(18-3)}{2} = \frac{18 \times 15}{2} = 135 ). Therefore, an 18-gon has 135 diagonals.
How many interior angles does a 18-gon have?
(18-2)*180 = 2880 degrees
How many triangles can you form in a hexagon from one vertex?
18
How many triangles are im a 20 gon?
18 triangles can be found in a 20-agon
How man triangles are in a 18-gon?
To find the number of triangles that can be formed in an 18-gon, you can use the formula for combinations: ( C(n, k) ), where ( n ) is the number of vertices and ( k ) is the number of vertices needed to form a triangle (which is 3). For an 18-gon, this is calculated as ( C(18, 3) = \frac{18!}{3!(18-3)!} = \frac{18 \times 17 \times 16}{3 \times 2 \times 1} = 816 ). Therefore, there are 816 triangles that can be formed from the vertices of an 18-gon.
How many sides on an 18-gon?
There are 18 sides
How many Rotational symmetries does a regular 18-gon have?
18
How many interior angles does a 18 gon have?
It has 18 interior angles.
How many diagonals does a n 18-gon have?
To find the number of diagonals in an 18-gon, you can use the formula ( D = \frac{n(n-3)}{2} ), where ( n ) is the number of sides. For an 18-gon, this gives ( D = \frac{18(18-3)}{2} = \frac{18 \times 15}{2} = 135 ). Therefore, an 18-gon has 135 diagonals.
How many interior angles does a 18-gon have?
(18-2)*180 = 2880 degrees
How many triangles can be formed from a vertex of 20 sided polygon?
18 triangles
What is the name of polygons from 11-20?
11- undecagon 12- dodecagon 13- 13-gon 14- 14-gon 15- 15-gon 16- 16-gon 17- 17-gon 18- 18-gon 19- 19-gon 20- 20-gon
How many triangles are in a 20 sided polygon?
18. If a polygon has n sides, then it has n-2 triangles.There are 18 triangles in a 20 sided polygon.
What is the sum of 18-gon?
The question makes no sense since a 18-gon cannot be added. You can add the measures of its interior or exterior angles, or the lengths of its sides, its diagonals and so on. But there is no such thing as a "sum of 18-gon".
Mesuare of a 18-gon?
the measure of an 18-gon triangle is found by using the polygon angle sum theorem.Thanx for the question!!(;
