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The sum of all interior angles of a polygon is 1080°. Find the number of sides of the polygon.
1. 8
2. 10
3. 11
4. 12

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Correct Answer - Option 1 : 8

Given:

The sum of all interior angles of a polygon is 1080°.

Formula used:

Sum of interior angles of a regular polygon of side 'n' = (n - 2) × 180° 

Calculation:

Let the number of sides be n

(n - 2) × 180 = 1080

⇒ n - 2 = 6

⇒ n = 8

∴ The number of sides is 8

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