If n is the number of sides, then the number of diagonals of a polygon is:
A. n/2
B. n/3
C. n(n-3)/2
D. n(n-3)/3
Answer:C
If n is the number of sides, then the number of diagonals of a polygon is:
A. n/2 B. n/3 C. n(n-3)/2 D. n(n-3)/3
Explanation: For a quadrilateral, n = 4