A) 16
B) 60
C) 90
D) 80
Correct Answer: C
Solution :
Key Idea: If there of en sides of a polygon, then total number of diagonals are\[{{\,}^{n}}{{C}_{2}}-=n.\] If there are 15 sides of a polygon, then total number of diagonals \[={{\,}^{15}}{{C}_{2}}-15\] \[=105-15\] \[=90\]
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