Question

2. If the number of diagonals in an n-sided
polygon is n (n-3)/2, what is the number of
diagonals in a decagon and a 25-sided
polygon?​

Answer 1

Answer:

35 and 275

Step-by-step explanation:

decagon-10sides

diagonals=10(10-3)/2

=35

25-sided polygon - diagonals=25(25-3)/2

=275