Find the sum of interior angles of a decagon.

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440°

1440°

1840°

2640°

answer is B.

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Detailed Solution

We know, a decagon has 10 sides.

Therefore, n = 10

Sum of interior angles = (2n - 4) × 90°

                                        = (2 × 10 - 4) × 90°

                                        = (20 - 4) × 90°

                                        = 16 × 90°

                                        = 1440°

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