Because they comply with the formula for the interior degrees of a polygon which is:
(number of sides-2)*180 = interior degrees
A quadrilateral has 4 sides so (4-2)*180 = 360 degrees
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All 4 sided quadrilaterals have 4 interior angles that add up to 360 degrees
360 degrees
All quadrilaterals have 4 interior angles that add up to 360 degrees.
The sum is equal to 360 degrees.
The 4 interior angles of 4 sided quadrilaterals add up to 360 degrees The exterior angles of any polygon add up to 360 degrees