Usage History of 'radii'

The following chart shows how frequently 'radii' appeared in printed materials over time. For example, the word 'radii' occurred 2 times in books in 1647 and 57,367 times in 2008. From 1647 to 2008, the word 'radii' was used a total of 2,003,691 times in books scanned by Google. See Reference: Google Ngram project.

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