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Number theorists are like lotus-eaters -- having once tasted of this food they can never give it up.
In H. Eves, Mathematical Circles Squared, Boston: Prindle, Weber and Schmidt, 1972.
Niccolo Tartaglia's General Trattato di Numeri et Misure
Here is the title page of part I of the General Trattato di Numeri (General Treatise on Number and Measure) (1556) of Niccolo Tartaglia (1500-1557). This is an extensive work on elementary mathematics that was popular in Italy for several decades after its publication.
Here if f. 29 of the General Treatise. Here Tartaglia is showing how to determine the area of an irregular curved shape.