explain with diagram
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sum of all angles of a quadrilateral is 360
so 4th angle is 360 - 260 = 100 °
so 4th angle is 360 - 260 = 100 °
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sum of quadrilateral=360°
60+80+120+forth angle
fourth angle =360-60+80+120
360-260=100
angle forth is 100°
60+80+120+forth angle
fourth angle =360-60+80+120
360-260=100
angle forth is 100°
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