Question

how many diagonals does each of these polygon have
a. 5- sided polygon
b. 8-sided polygon ​

Answer 1

Step-by-step explanation:

the formula for obtaining diagonal is

=n(n-3)/2

a. 5-sided

5(5-3)/2=5 diagonals

b. 8-sided

8(8-3)/2=20 diagonals

Answer 2

Answer: Pentagon = 5

Octagon = ?