Answer:
Nine triangles
Step-by-step explanation:
Refer to image for diagram~
1. Draw a regular nonagon.
Since we are drawing a regular nonagon, all the sides of the nonagon must be equal and in proper place.
Refer to image 1 for diagram
2. Join all the vertices of a regular nonagon to its center.
Take any corner and draw a line from it to the center of the nonagon. This should also be done to the other vertices.
Refer to image 2 for diagram
3. Count the number of triangles formed by the lines.
When we look at the image, we can tell that nine triangles are formed when the vertices of a regular nonagon are joined to its center.
Refer to image 3 for diagram
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