Any 4 sided quadrilateral has 4 interior angles that add up to 360 degrees
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The sum of the interior angles of a quadrilateral is 360 degrees.
exterior angle theorem
360
If you are referring to Pythagoras' theorem for right angle triangles then the theorem states that for any right angle triangle the square of its hypotenuse is equal to the sum of its squared sides.
360 degrees are supposed to be in a quadrilateral so 360 - 270 = 90 degrees