All of the angles inside of any 4-sided figure add up to 360 degrees.
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All the interior angles add up to 360 degrees.
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.
Exterior angles add up to 360 degrees Interior angles add up to 1080 degrees
The 3 interior angles of a triangle add up to 180 degrees
Interior angles of all triangles add up to 180 degrees.