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Nine, as a n-gon can be cut in n-2 triangles.

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Q: How many triangles does it take to make a undecagon?
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Related questions

How many triangles does it take to make a decagon?

10 triangles


How many triangles would it take to make hexagon?

To form a hexagon, you would need a total of 6 triangles. Each side of the hexagon would be made up of one triangle, so when you combine all six sides, it creates a hexagon. This is because a hexagon is a polygon with six sides and six angles, and each side is made up of a single triangle.


How many triangles does it take to make a nonagon?

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How many triangles can make a hexagon?

4 triangles make 1 hexagon. (easy way to find out how many triangles there are in a polygon- take number of sides of the polygon, subtract 2 from it, that's your answer!)


Can you make a trapezoid with triangles?

Yes, you can but it take 3 triangles.


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4, one for each side face


How many triagles would it take to make a parallelogram?

It needs only 2 triangles to construct a parallelogram


How many triangles does it take to make a rectangle?

A minimum of 2 triangles are needed, but you can also make a rectangle with 3 or more triangles.


How many triangle doese it take to make a rhombus?

2 triangles make up a rhombus which has 4 interior angles adding to 360 degrees and a triangles has 3 interior angles add up to 180 degrees. Therefore: 360/180 = 2 triangles


How do you make three triangles with nine matches?

take three match for each triangle


How do you make a model food pyramid for homework?

to make a model of a food pyramid take a cardboard and cut it in 3 triangles and then make a triangle shape with those triangles,then go to the web and search pic of foodpyramid


How many triangles does a 20 sided polygon contain?

it would have 18 triangles because u take 2 away each time.