Enneacontagon
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A shape does not have a sum. You can sum its angles, the lengths of its sides, the areas of its faces and so on. But the shape does not have a sum, in itself.
The sum of the interior angles is 360 and the sum of the exteriors is 360 also.
angle sum of a parallelogram
It means the sum of the angles measurement.
the sum of the angle in a octagon is 1080