I already know that 円い 「まるい」 means circular, but I am watching a hundred of
times 丸い, and I think it's also pronounced まるい.

Could you give me some examples of both 丸い and 円い？

Also, are both exchangeable in all senteces?
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2018-10-03T15:32:39.470
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2018-10-03T15:32:39.470
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What's the difference between 円い and 丸い?