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the sum of all interior angles of a quadrilateral is 360°.
so, 50° + 130° + 120° +x = 360°
or, 300° +x = 360°
or, x= 360°-300°
therefore , x is equal to 60°.
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it is a quadrilateral and we know that sum of all angles of quadrilateral is 360 degree
so, 50 + 130 + 120 + x = 360
= 300+x=360
x=360-300
x=60
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