The table below shows how many triangles are formed when all the diagonals are drawn from one vertex in different regular polygons. Based on the information in the table, which of the following statements is true? The number of triangles formed in any regular polygon is 2 less than the number of sides in the polygon. The number of triangles formed in any regular polygon is half the number of sides in the polygon. All the triangles formed in each regular polygon are congruent. All the triangles formed in each regular polygon are isosceles.