Are these cis/trans isomers? Why or why

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Are these cis/trans isomers? Why or why not?

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Let's hear your take on it first.
 


Yes, because the O and the OH can be switched. Because the ring structure can not be changed?
espen180 said:
Let's hear your take on it first.
 


Given two molecules, what is needed for them to be called cis/trans-isomers?