And
16 If it be halfed by two plaines halfing the opposite sides, the common bisection and diagony doe halfe one another 39. p xj.
Because here the diameters (such as is that bisection) are halfed betweene themselves [or doe halfe one another.] Let the parallelepipedum aeiouy, be cut in to y the halfs by two plains, fro srlm, uivf, halfing the opposite sides: Here the common section ts, and the diagony ao, doe cut one another.
17 If three lines be proportionall, the parallelepipedum of meane shall be equall to the equiangled parallelepipedum of all them. è 36. p xj.
It is a consectary out of the [8 e].
18 Eight rectangled parallelepiped's doe fill a solid place.
19 The Figurate of a rectangled parallelepipedum is called a solid, made of three numbers 17. d vij.
As if thou shalt multiply 1, 2, 3. continually, thou shalt make the solid 6. Item if thou shalt in like manner multiply 2, 3, 4. thou shalt make the solid 24. And the sides of that solid