Form of the Square

And because this base and square is small and of little foundation, it is enlarged by dividing the number in half and multiplying one by the other, joining the numbers together and performing the subtraction

7. 6. 5. 8. as it shall seem best to you, and thus
4. 9. 7. 3. in a similar example by making
8. 4. 13. 1. 20. 14. 5. from 12. 3. and this square
machine or base forms the third rule
of the quadrature

3. 4. 2. 4.
3. 4. 3. 5.
6. 8. 5. 9.
9. 12. 8. 4.
4. 3. 2. 5.
5. 12. 4. 2.

You see that 7 and 6 make
13; from 6 and 5 is made 11, which we
may speak of on another occasion;
and by a similar example we
shall observe further below that this
quadrature shall serve whenever

in the aforementioned square one
cannot find the answer to the proposition
concerning that which one wishes to seek.