Correct Answer - Option 2 :
\(\dfrac{3\pi}{4}\)
Concept:
The interior angle of a regular polygon is given by:
\(\rm (n - 2) \times \frac{180^{\circ}}{n}\)
Where, n = number of sides
Interior Angle = 180°- Exterior Angle
Calculation:
Regular Octagon has 8 sides
so, n = 8
Interior Angle
= \(\rm (n - 2) \times \frac{180^{\circ}}{n}\)
= \(\rm (8 - 2) \times \frac{180^{\circ}}{8}\)
= \(\rm 6 \times \frac{180^{\circ}}{8}\)
= \(\dfrac{3\pi}{4}\)
