The sum of the interior angles of a polygon depends on the number of sides.
The formula for n sides is sum = 180 (n-2)
So for a triangle it is 180 degrees, for a quadrilateral 360 degrees, and for a pentagon 540 degrees.
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The interior angles of a triangle add up to 180o. The interior angles of a square add up to 360o. Other shapes have other angles.
The 7 interior angles of a heptagon add up to 900 degrees
The 17 interior angles add up to 2700 degrees
The 3 interior angles of any triangle always add up to 180 degrees
The 4 interior angles add up to 360 degrees