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.
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Everyday Math Grade 4 – Lesson 3.10 Open Sentences - ppt download
Solve the riddle: I am a polygon. I have two right angles. I have only one pair of parallel sides. What am I?
Solve the following riddle: I am a polygon I have two right angles I have only one pair of parallel sides, who am I?
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