A) 28
B) 48
C) 20
D) None of these
Correct Answer: C
Solution :
The total number of lines obtained by joining 8 vertices of octagon \[={{\,}^{8}}{{C}_{2}}=\frac{8.7}{2}=28\] But out of these 28 lines, 8 are sides and remaining are diagonals. Hence, the number of diagonals \[=28-8=20\]
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