A) \[210\]
B) \[190\]
C) \[180\]
D) \[170\]
Correct Answer: D
Solution :
Number of diagonals in a polygon of n sides \[{{=}^{n}}{{C}_{2}}-n\] Here, \[n=20\] \[\therefore \] Required number of diagonals \[{{=}^{20}}{{C}_{2}}-20\] \[=\frac{20\times 19}{2\times 1}-20\] \[=170\]
You need to login to perform this action.
You will be redirected in
3 sec
