And these angles (as you see) are made partly of streght lynes, partly of croken lines, and partly of both together. Howbeit in right angles I haue put none example of croked lines, because it would
muche trouble a lerner to iudge them: for their true iudgment doth appertaine to arte perspectiue, and as I may say, rather to reason then to sense.
| Sharpe angles. | Blunte or brode angles. |
But now as of many prickes there is made one line, so of diuerse lines are there made sundry formes, figures, and shapes, whiche all yet be called by one propre name, A platte forme. Platte formes, and thei haue bothe length and bredth, but yet no depenesse.
And the boundes of euerie platte forme are lines: as by the examples you maie perceiue.
Of platte formes some be plain, and some be croked, and some parly plaine, and partlie croked.
A plaine platte. A plaine platte is that, whiche is made al equall in height, so that the middle partes nother bulke vp, nother shrink down more then the bothe endes.
A crooked platte. For whan the one parte is higher then the other, then is it named a Croked platte.
And if it be partlie plaine, and partlie crooked, then is it called a Myxte platte, of all whiche, these are exaumples.
| A plaine platte. | A croked platte. | A myxte platte. |