A square is just a special type of quadrilateral and has 4 angles of 90o. It follows that any quad has the same total ie 360o.
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The 4 interior angles of a 4 sided quadrilateral add up to 360 degrees
The sum of the 4 interior angles of any quadrilateral add up to 360 degrees.
The 4 interior angles of any 4 sided quadrilateral add up to 360 degrees and using a protractor will prove it.
The 4 interior angles of any quadrilateral add up to 360 degrees
The 4 interior angles of any quadrilateral always add up to 360 degrees