This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Diophantus VI . Area trianguli rectanguli in numeris non potest esse quadratus hujus theorematis nobis inventi demonstrationem quam et ipsi tandem non sine operosa laboriosa meditatione deteximus subiungemus Hoc nempe demonstrandi genus miros in arithmeticis suppeditabit progressus si area trianguli esset quadratus darentur duo