YT

abbreviation for

Y.T.

Therfore doe I creaue that you will accept this little Booke, and take yt In goode partte.

First open your compasse as largely as you can, so that it do not excede the length of the shortest line yt incloseth the angle.

And than frome that corner if you drawe a lyne by the other edge of the squyre, yt will be perpendicular to the former line.

Make in a table the like draught of yt circference by the self patr, vsing it as it wer a croked ruler.

And then haue I made three angles vpon that one touch line, and in yt one point F, and those iij.

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