There is a figure called a heptagon or an octagon but no such figure as a hectogon. It is, therefore, impossible to answer the question.
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Sadly, there is no such shape. There is a heptagon or an octagon but a hectogon simply does not exist. And, since it does not exist, it has no interior angles. And since there are no interior angles, there is no total measure for them. I suggest you check out a mathematical site or a dictionary and figure out what you want and re-post the corrected question.
The sum of the interior angles is 360.
The sum of the four interior angles of a trapezoid is 360 degrees.
(number of sides-2)*180 = sum of the interior angles
The sum of the 4 interior angles of a trapezoid add up to 360 degrees.