a trapezium ,perhaps
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It is just an irregular quadrilateral.
octegon
Yes, a quadrilateral just need to have 4 sides. Quad- means 4 and -lateral means sides. To have only one tight angle, it has to be either a right angle with 2 acute angles and 1 obtuse angle OR a right angle with 2 obtuse angle s and 1 acute angle.
It is a right angled trapezoid
isolese triangle