The sum of its interior angles is 900 degrees.
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A heptagon has 900 degrees, which each angle measuring 900/7, or 128.5714286 degrees
The exterior angles of a heptagon add to 360 degrees The interior angles add to 900 degrees.
900 overall
An heptagon has 7 interior angles that add up to 900 degrees.
Interior: 900 degrees Exterior: 360 degrees