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CM be added to each;
therefore
the whole AM is equal to the gnomon NOP .
But
AM is the rectangle AD, DB, for DM is equal to DB;
therefore
the gnomon NOP is also equal to the rectangle AD, DB.
Let
LG, which is equal to the square on BC, be added to each;
therefore
the rectangle contained by AD, DB and the square on CB are equal to the gnomon NOP and LG.
