Mathematics

Grade9

Easy

Question

# The sum of angles of an octagon is ______.

- 120°
- 1080°
- 450°
- 180°

Hint:

### Interior angle = (n-2) × 180∘ (Octagon has 8 sides)

## The correct answer is: 1080°

### option B is the correct answer

1080°

sum of all Interior angle = (n-2) × 180∘

Where n is the number of sides in a polygon.

Interior angle = (n-2) × 180∘ (Octagon has 8 sides)

= 6 × 180∘ = 1080∘

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