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What is the maximum number of interior right angles that can be used to form a 9-sided polygon

 Feb 20, 2020
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What is the maximum number of interior right angles that can be used to form a 9-sided polygon   

 

If it has to be a regular nonagon, the answer is none, of course. 

If it can be any shape at all, I can make one with 7 right angles. 

 

I wish I knew how to draw on this site, I'd show you an example. 

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 Feb 20, 2020

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