There are 67-2 = 65 triangles
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There are: 13-2 = 11 triangles
There are: 23-2 = 21 triangles
many triangles does a regular 46-gon have
18 triangles can be found in a 20-agon
20 isosceles triangles with each base being a side of the 20-gon, and the opposite vertices at the center of the polygon.