The number of diagonals in a convex n-sided regular polygon = n(n-3)/ 2 , where n is the number of polygon sides.  Q. How many diagonals are drawn in a triangle? Sol. Number of sides = 3 then formula = n(n-3)/2 = 3(3-3)/ 2 = 3(0)/ 2 = 0 Q. How many diagonals are drawn …