A trapezoid, or any number of other polygons. A trapezoid is the polygon with the fewest sides fitting the criteria, however there are multiple polygons which suffice (since it was not specified that the polygon must be regular). A few examples should show how to generate a polygon with any number of sides what has two right angles and a single pair of parallel sides.
Understanding Elementary Shapes
2D Shapes Geometry Activities - Saddle Up for 2nd Grade
Everyday Math Grade 4 – Lesson 3.10 Open Sentences Copyright
Everyday Math Grade 4 – Lesson 3.10 Open Sentences Copyright
Shapes riddles grade 2
Solve the following riddle: I am a polygon I have two right angles I have only one pair of parallel sides, who am I?
Cross Word for Understanding Quadrilaterals - WordMint
Solve the following riddle: I am a polygon I have two right angles I have only one pair of parallel sides, who am I?
Dividing the rectangle into n right-angled triangles - GeeksforGeeks
Solve the riddle: I am a polygon. I have two right angles. I have only one pair of parallel sides. What am I?
Quadrilaterals: Classification
Shapes! - Cups and Pages
Everyday Math Grade 4 – Lesson 3.10 Open Sentences Copyright
What is a quadrilateral with only 2 right angles?
Polygons CK-12 Foundation