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You could draw four different triangles in a 4-sided polygon, but two are enough to define the polygon.
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A ten-sided polygon is called a decagon.
To calculate the number of triangles that can be formed by connecting the vertices of a 20-sided polygon, we can use the formula n(n-1)(n-2)/6, where n is the number of vertices. For a 20-sided polygon, n = 20, so the formula becomes 20(20-1)(20-2)/6 = 1140. Therefore, you can fit 1140 triangles within a 20-sided polygon.
To calculate this, you must find out how many triangles you can draw into the shape. Do this by taking the total number of sides (s) and taking away 2. This leaves you with how many triangles you can draw in the shape (t) from one vertex to another. (Not including outside lines!). Then, multiply the number of triangles in the shape by 180. This leaves you with how many degrees are inside that shape. (a)t = s-2a = t X 180This means there are 1800 degrees in a 12 sided polygon.