how many diagonals does a polygon with 19 sides have , if one of its vertices does not connect to any diagonal ?
"if i calculate it using the formulae , # diagonals = n ( n - 3 ) / 2 each vertex sends of n - 3 diagonals n = 19 - 1 then 18 * ( 18 - 3 ) / 2 = 135 correct option : a"
divide(multiply(subtract(19, const_1), subtract(subtract(19, const_1), const_3)), const_2)