10. The difference between $180^{\circ}$ and each interior angle of a quadrilateral is called the angle defect of that angle. The sum of the angle defects of all interior angles of a quadrilateral is 
$\qquad$ degrees.
【Key Point】Triangle Interior Angles
【Difficulty】Adjacent

【Answer】 360
【Solution】 $180^{\circ} \times 4$ - Sum of interior angles of a quadrilateral $=360^{\circ}$