If a polygon has 8 sides, then the number of diagonals it has is:
Answer & explanation
Correct answer: option 3
The formula to find the number of diagonals is:
D = n (n – 3)/2, where n stands for the number of sides
According to the question, n= 8
D = 8 ( 8 – 3)/2
D = 8 (5)/2
D = 20