how many internal diagonals does a hexagon ( 6 sided polygon ) have ?  Choose the correct choice from the following answers:
A) 5
B) 6
C) 8
D) 9
E) 10

Rationale: number of diagonals in any polygon can be found using this formula : n ( n - 3 ) / 2 here n = 6 no . of diagonals = 6 ( 6 - 3 ) / 2 = 9 ans d
Answer: D