KCET2025MathematicsPermutation and Combination
The number of diagonals that can be drawn in an octagon is
Options
- A15
- B20
- C28
- D30
Correct answer
B. 20
Step-by-step solution
A octagon has 8 sides. The number of diagonals in a polygon is n ( n -3) 2 , Where n is the number of sides. 8(8-3) 2 =4.5=20