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The internal angle sum of a polygon can be calculated using the formula ( (n - 2) \times 180^\circ ), where ( n ) is the number of sides. For a polygon with 20 sides, the calculation would be ( (20 - 2) \times 180^\circ = 18 \times 180^\circ = 3240^\circ ). Therefore, the internal angle sum of a polygon with 20 sides is 3240 degrees.

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6d ago

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