whose sides are equalle. For and if the one side be longer then the other, that figure in Geometrie is called long square, and so it is named in number, a long square also.
Now if I sette doune the figure of your number, as you termed it, and sette. 4. for the one side, and. 9. for the other, this will the figure shewe.
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Where you se a plain long square: yet is the whole number that amounteth of this multiplication: truely named a square number, as here you maie see. but then is the side or roote of it, neither. 4. nor. 9. but. 6.
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Scholar. Now I vnderstande it: and the better by this figuralle example. A roote. And here also I haue learned what a Roote is: for you seme to expounde it, to bee the side of a figuralle number.
Master. Euery flatte nomber, and euery sounde number also haue their sides: But no flatte number, saue onely squares haue a roote: bicause a roote in flatte numbers, is a number multiplied by it self.
And i nsounde numbers, thei onely haue rootes, whiche bee made by many multiplications, of some one nūber by it self: other by that, whiche riseth of it.
As when I saie, twoo tymes, twoo twise, maketh 8. that number is a sounde number: and is named a Cube. And so. 3. tymes. 3. thrise, doeth make. 27. whiche is also a Cube.
A cube. And generally, any number that is made by suche 2. multiplication, is called a Cube, or Cubike number. And the number of that multiplication, whiche commonly is named the multiplier, A cubike roote. is in this pouncte called the Cubike roote of that number.
A cubike nomber. Wherefore, thus also maie you define a Cubike nō-ber,
