SOLUTION: If a quadrilateral has at least one right angle, then it is a rectangle

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Question 234105: If a quadrilateral has at least one right angle, then it is a rectangle
Answer by Alan3354(69443) About Me  (Show Source):
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If a quadrilateral has at least one right angle, then it is a rectangle
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False. The angles can be, for example, 90, 80, 80, 110 degrees.
1 counter example is sufficient to disprove.