Usage History of 'diagonals'

The following chart shows how frequently 'diagonals' appeared in printed materials over time. For example, the word 'diagonals' occurred 6 times in books in 1658 and 28,345 times in 2008. From 1658 to 2008, the word 'diagonals' was used a total of 696,918 times in books scanned by Google. See Reference: Google Ngram project.

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