| A lynearic numbre. | |
| Trianguler numbres | |
| Longsquare nũbre. | |
| Iust square numbres | |
| a threcornered spire. | |
| A square spire. |
And so maie there be infinite formes more, whiche I omitte for this time, cõsidering that their knowledg appertaineth more to Arithmetike figurall, than to Geometrie.
But yet one name of a pricke, whiche he taketh rather of his place then of his fourme, maie I not ouerpasse. And that is, when a pricke standeth in the middell of a circle (as no circle can be made by cõpasse without it) then is it called a centre. A centre And thereof doe masons, and other worke menne call that patron, a centre, whereby thei drawe the lines, for iust hewyng of stones for arches, vaultes, and chimneies, because the chefe vse of that patron is wrought by findyng that pricke or centre, from whiche all the lynes are drawen, as in the thirde booke it doeth appere.
Lynes make diuerse figures also, though properly thei maie not be called figures, as I said before (vnles the lines do close) but onely for easie maner of teachyng, all shall be called
figures, that the eye can discerne, of whiche this is one, when one line lyeth flatte (whiche is named A ground line. the ground line) and an other commeth downe on it, and is called A perpendicular. A plume lyne. a perpendiculer or plũme lyne, as in this example you may see. where .A.B. is the grounde line, and C.D. the plumbe line.
And
like waies in this figure there are three lines, the grounde lyne whiche is A.B. the plumme line that is A.C. and the bias line, whiche goeth from the one of thẽ to the other, and lieth against the right corner in such a figure whiche is here .C.B.
But