DelMonte, Guidubaldo, Mechanicorvm Liber

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1
PROPOSITIO VI.
Sit AB recta linea, cui ad angulos ſit rectos
AD, quæ ex parte A producatur vtcunq; vſq;
ad C; connectaturq; CB, quæ ex parte B quoq;
producatur vſq; ad E. ducantur deinde à pun­
cto B vtcunq; inter AB BE lineæ BF BG ipſi
AB æquales; à punctiſq; FG ipſis perpendicula­
res ducantur FH GK, quæ & inter ſe ſe, & ipſi
AD conſtituantur æ­
quales, ac ſi BA AD
motæ ſint in BF FH,
& in BG GK; con­
nectanturq; CH CK,
quæ lineas BF BG
in punctis MN ſe­
cent.
Dico BN mi­
norem eſſe BM, &
BM ipſa BA.
99[Figure 99]
Connectantur BD BH
BK.
& quoniam duæ lineæ
DA AB duabus HF FB
ſunt æquales, & angulus
DAB rectus recto HFB eſt
etiam æqualis; erunt reliqui
anguli reliquis angulis æqua­
les, & HB ipſi DB æqualis.

ſimiliter oſtendetur triangu­
lum BkG triangulo BHF æqualem eſſe.
quare centro B, inter­

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