The vse of them you shall se largely in the practise of this arte.
But to the intent you maie the better obserue and regarde these twoo laste kindes of nombers: whiche are commonly neglected of artes men, I will shewe you some vse of them, with their properties.
Of diametralle nombers. Firste, all diametralle nombers doe sette forthe a triangle, hauyng all three sides knowen: whiche thyng as it doeth serue to many and wonderfull purposes: so can it be found in no other nombers, then onely in diametrall nombers.
For although in figures Geometricalle, you maie euer more vnfallibly finde one line, that will make a square, equall to the twoo squares of any other twoo lines (as in the patthe waie you doe see it taught) yet the measure certaine of those sides, are not knowen.
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Wherfore in nomber that is not possible alwaies to be doen: neither can it be doen with any other nōbers, then onely diametricall nombers. Yet maie other nombers go very nigh. As namely in these examples of square nombers: whose double, I take for the squa-res
