1
DE MOTU
CORPORUM
CORPORUM
LEMMA XXVII.
Trapezium ſpecie datum deſcribere cujus anguli ad rectas quatuor po
ſitione datas, quæ neque omnes parallelæ ſunt, neque ad commune
punctum convergunt, ſinguli ad ſingulas conſiſtent.
ſitione datas, quæ neque omnes parallelæ ſunt, neque ad commune
punctum convergunt, ſinguli ad ſingulas conſiſtent.
Dentur poſitione rectæ quatuor ABC, AD, BD, CE,qua
rum prima ſecet ſecundam in A,tertiam in B,& quartam in C:
& deſcribendum ſit Trapezium fghiquod ſit Trapezio FGHI
68[Figure 68]
ſimile, & cujus angulus f,angulo dato Fæqualis, tangat rectam
ABC,cæterique anguli g, h, i,cæteris angulis datis G, H, Iæqua
les, tangant cæteras lineas AD, BD, CEreſpective. Jungatur
FH& ſuper FG, FH, FIdeſcribantur totidem circulorum ſeg
menta FSG, FTH, FVI; quorum primum FSGcapiat angu-
rum prima ſecet ſecundam in A,tertiam in B,& quartam in C:
& deſcribendum ſit Trapezium fghiquod ſit Trapezio FGHI
68[Figure 68]ſimile, & cujus angulus f,angulo dato Fæqualis, tangat rectam
ABC,cæterique anguli g, h, i,cæteris angulis datis G, H, Iæqua
les, tangant cæteras lineas AD, BD, CEreſpective. Jungatur
FH& ſuper FG, FH, FIdeſcribantur totidem circulorum ſeg
menta FSG, FTH, FVI; quorum primum FSGcapiat angu-