to find the total number of diagonals for any given polygon, you can use the expression n(n-3) divided by 2, where n is the number of sides of the polygon

Adetermine the minimum value that n could be
Bmake a table of four possible values of n. then complete the table by evaluating the expression for each value of n.
Ccheck by drawing the diagonals of a pentagon and counting the diagonals