You can have an infinite number of triangles in a polygon, it would really depend on the size of the triangles you are trying to fit in.
If on the other hand you mean that triangles are made by joining the point of the polygon to make triangles then it's the number of sides minus two.
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n(sides)-2
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There can be no formula for the number of triangles within the polygon. Any triangle can be split into two by a line from one of the vertices to the opposite side. Thus the number of triangles can be increased by one by simply splitting one triangle. And then THAT triangle can be split in two, and the that one, ...
The formula is: 0.5*(n2-3n) where n is the number of sides of the polygon
3, it's called a triangle.
Formula for finding the total sum of interior angles of any polygon is: (number of sides-2)*180 A triangle has 3 sides. (3-2)*180 = 180 degrees
The formula is: 0.5*(n2-3n) = diagonals whereas n is the number of sides of the polygon