720 because the angle sum is the (number of sides minus 2) multiplied by 180.
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Exterior angles of both polygons add up to 360 degrees
They are both polygons whose exterior angles add up to 360 degrees.
It is a 6 sided irregular or regular polygon whose interior angles add up to 720 degrees and its exterior angles add up to 360 degrees.
The shared interior angles add up 240 degrees so the shared outside angles add up to 120 degrees because angles around a point add up to 360 degrees
The 7 interior angles of an heptagon add up to 900 degrees