8. Using the formula for sum of polygon interior angles, what would be the sum of the interior angles of an octagon?
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135 °
1080 °
1440 °
The sum of the interior angles of an octagon can be found using the formula (n-2) * 180, where n is the number of sides of the polygon.
For an octagon (n=8), the sum of the interior angles would be (8-2) * 180 = 6 * 180 = 1080 degrees.
Therefore, the correct answer is 1080 °.