Answer:
10 triangles
Step-by-step explanation:
You will make 10 triangles
If you draw all of the diagonals from one vertex of a regular decagon, you can make 8 triangles.
From a given vertex of a polygon with n sides, (n-3) diagonals can be drawn. Every diagonal drawn from a single vertex of a polygon creates one triangle within the polygon, except for the last diagonal, which creates two triangles. This means that n-2 triangles can be drawn into a given n-sided polygon.
Number of sides in a decagon = n = 10
Number of triangles in a decagon if you draw all of the diagonals from one vertex = n - 2 = 8
Learn more about number of triangles in a regular polygon here
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