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January 2018[change source]

Welcome to Wikipedia. Everyone is welcome to make helpful changes to Wikipedia. However, some of your changes, like those to "Obtuse angle", did not seem to be helpful and have been reverted or removed. If you want to try out changing Wikipedia to learn more about how it works, please use the sandbox. Thank you. DaneGeld (talk) 21:58, 8 January 2018 (UTC)[reply]