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The sum of all internal angles of a regular polygon whose one external angle is 20° is
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- 6400°
- 3200°
- 2880°
- 1440°
- 6400°
Correct Option: C
Here , External angle = 20°
| Number of sides of a regular polygon (n) = | = 18 | |
| 20 |
∴ Sum of all interior angles = (2n – 4) × 90°
Sum of all interior angles = (2 × 18 – 4) × 90°
Sum of all interior angles = 32 × 90° = 2880°
